956718778681 has 2 divisors, whose sum is σ = 956718778682. Its totient is φ = 956718778680.

The previous prime is 956718778633. The next prime is 956718778747. The reversal of 956718778681 is 186877817659.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 827772432400 + 128946346281 = 909820^2 + 359091^2 .

It is a cyclic number.

It is not a de Polignac number, because 956718778681 - 2³⁵ = 922359040313 is a prime.

It is a super-2 number, since 2×956718778681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (956718778381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 478359389340 + 478359389341.

It is an arithmetic number, because the mean of its divisors is an integer number (478359389341).

Almost surely, 2^956718778681 is an apocalyptic number.

It is an amenable number.

956718778681 is a deficient number, since it is larger than the sum of its proper divisors (1).

956718778681 is an equidigital number, since it uses as much as digits as its factorization.

956718778681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 284497920, while the sum is 73.

The spelling of 956718778681 in words is "nine hundred fifty-six billion, seven hundred eighteen million, seven hundred seventy-eight thousand, six hundred eighty-one".