687507799117 has 4 divisors (see below), whose sum is σ = 687513151036. Its totient is φ = 687502447200.

The previous prime is 687507799087. The next prime is 687507799127. The reversal of 687507799117 is 711997705786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 339211891561 + 348295907556 = 582419^2 + 590166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687507799117 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 (687507799127) 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, 2478408 + ... + 2741809.

It is an arithmetic number, because the mean of its divisors is an integer number (171878287759).

Almost surely, 2^687507799117 is an apocalyptic number.

It is an amenable number.

687507799117 is a deficient number, since it is larger than the sum of its proper divisors (5351919).

687507799117 is a wasteful number, since it uses less digits than its factorization.

687507799117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351918.

The product of its (nonzero) digits is 46675440, while the sum is 67.

The spelling of 687507799117 in words is "six hundred eighty-seven billion, five hundred seven million, seven hundred ninety-nine thousand, one hundred seventeen".