686948935537 has 2 divisors, whose sum is σ = 686948935538. Its totient is φ = 686948935536.

The previous prime is 686948935501. The next prime is 686948935577. The reversal of 686948935537 is 735539849686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684319399696 + 2629535841 = 827236^2 + 51279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686948935537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686948935537.

It is not a weakly prime, because it can be changed into another prime (686948935577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343474467768 + 343474467769.

It is an arithmetic number, because the mean of its divisors is an integer number (343474467769).

Almost surely, 2^686948935537 is an apocalyptic number.

It is an amenable number.

686948935537 is a deficient number, since it is larger than the sum of its proper divisors (1).

686948935537 is an equidigital number, since it uses as much as digits as its factorization.

686948935537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1175731200, while the sum is 73.

The spelling of 686948935537 in words is "six hundred eighty-six billion, nine hundred forty-eight million, nine hundred thirty-five thousand, five hundred thirty-seven".