660937982251 has 8 divisors (see below), whose sum is σ = 673607280384. Its totient is φ = 648276046080.

The previous prime is 660937982249. The next prime is 660937982281. The reversal of 660937982251 is 152289739066.

660937982251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660937982251 - 2¹ = 660937982249 is a prime.

It is a super-4 number, since 4×660937982251⁴ (a number of 48 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (660937982281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1659046 + ... + 2018491.

It is an arithmetic number, because the mean of its divisors is an integer number (84200910048).

Almost surely, 2^660937982251 is an apocalyptic number.

660937982251 is a deficient number, since it is larger than the sum of its proper divisors (12669298133).

660937982251 is a wasteful number, since it uses less digits than its factorization.

660937982251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680981.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 660937982251 in words is "six hundred sixty billion, nine hundred thirty-seven million, nine hundred eighty-two thousand, two hundred fifty-one".