687066270378601 has 3 divisors (see below), whose sum is σ = 687066296590551. Its totient is φ = 687066244166652.

The previous prime is 687066270378589. The next prime is 687066270378611. The reversal of 687066270378601 is 106873072660786.

The square root of 687066270378601 is 26211949.

It is a perfect power (a square), and thus also a powerful number.

687066270378601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2604515050201 + 684461755328400 = 1613851^2 + 26162220^2 .

It is not a de Polignac number, because 687066270378601 - 2¹³ = 687066270370409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687066270378611) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13105975 + ... + 39317923.

It is an arithmetic number, because the mean of its divisors is an integer number (229022098863517).

Almost surely, 2^{687066270378601} is an apocalyptic number.

687066270378601 is the 26211949-th square number.

687066270378601 is the 13105975-th centered octagonal number.

It is an amenable number.

687066270378601 is a deficient number, since it is larger than the sum of its proper divisors (26211950).

687066270378601 is an frugal number, since it uses more digits than its factorization.

687066270378601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52423898 (or 26211949 counting only the distinct ones).

The product of its (nonzero) digits is 170698752, while the sum is 67.

The spelling of 687066270378601 in words is "six hundred eighty-seven trillion, sixty-six billion, two hundred seventy million, three hundred seventy-eight thousand, six hundred one".