660137915687 has 4 divisors (see below), whose sum is σ = 682901292120. Its totient is φ = 637374539256.

The previous prime is 660137915681. The next prime is 660137915699. The reversal of 660137915687 is 786519731066.

660137915687 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.

It is a cyclic number.

It is not a de Polignac number, because 660137915687 - 2¹⁴ = 660137899303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660137915681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11381688173 + ... + 11381688230.

It is an arithmetic number, because the mean of its divisors is an integer number (170725323030).

Almost surely, 2^660137915687 is an apocalyptic number.

660137915687 is a deficient number, since it is larger than the sum of its proper divisors (22763376433).

660137915687 is a wasteful number, since it uses less digits than its factorization.

660137915687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22763376432.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 660137915687 in words is "six hundred sixty billion, one hundred thirty-seven million, nine hundred fifteen thousand, six hundred eighty-seven".