687970713637 has 2 divisors, whose sum is σ = 687970713638. Its totient is φ = 687970713636.

The previous prime is 687970713593. The next prime is 687970713697. The reversal of 687970713637 is 736317079786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637579892196 + 50390821441 = 798486^2 + 224479^2 .

It is a cyclic number.

It is not a de Polignac number, because 687970713637 - 2¹⁵ = 687970680869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687970713697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343985356818 + 343985356819.

It is an arithmetic number, because the mean of its divisors is an integer number (343985356819).

Almost surely, 2^687970713637 is an apocalyptic number.

It is an amenable number.

687970713637 is a deficient number, since it is larger than the sum of its proper divisors (1).

687970713637 is an equidigital number, since it uses as much as digits as its factorization.

687970713637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56010528, while the sum is 64.

The spelling of 687970713637 in words is "six hundred eighty-seven billion, nine hundred seventy million, seven hundred thirteen thousand, six hundred thirty-seven".