690875153721 has 9 divisors (see below), whose sum is σ = 997934379429. Its totient is φ = 460581773436.

The previous prime is 690875153719. The next prime is 690875153729. The reversal of 690875153721 is 127351578096.

The square root of 690875153721 is 831189.

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

690875153721 is a `hidden beast` number, since 6 + 9 + 0 + 87 + 5 + 1 + 537 + 21 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 690875153721 - 2¹ = 690875153719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (690875153729) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2355036 + ... + 2632098.

Almost surely, 2^690875153721 is an apocalyptic number.

690875153721 is the 831189-th square number.

690875153721 is the 415595-th centered octagonal number.

It is an amenable number.

690875153721 is a deficient number, since it is larger than the sum of its proper divisors (307059225708).

690875153721 is an frugal number, since it uses more digits than its factorization.

690875153721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554132 (or 277066 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The spelling of 690875153721 in words is "six hundred ninety billion, eight hundred seventy-five million, one hundred fifty-three thousand, seven hundred twenty-one".