687505796137 has 4 divisors (see below), whose sum is σ = 709683402496. Its totient is φ = 665328189780.

The previous prime is 687505796101. The next prime is 687505796177. The reversal of 687505796137 is 731697505786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687505796137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687505796177) 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, 11088803133 + ... + 11088803194.

It is an arithmetic number, because the mean of its divisors is an integer number (177420850624).

Almost surely, 2^687505796137 is an apocalyptic number.

It is an amenable number.

687505796137 is a deficient number, since it is larger than the sum of its proper divisors (22177606359).

687505796137 is a wasteful number, since it uses less digits than its factorization.

687505796137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22177606358.

The product of its (nonzero) digits is 66679200, while the sum is 64.

The spelling of 687505796137 in words is "six hundred eighty-seven billion, five hundred five million, seven hundred ninety-six thousand, one hundred thirty-seven".