396868868681 has 2 divisors, whose sum is σ = 396868868682. Its totient is φ = 396868868680.

The previous prime is 396868868659. The next prime is 396868868731. The reversal of 396868868681 is 186868868693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277302294025 + 119566574656 = 526595^2 + 345784^2 .

It is a cyclic number.

It is not a de Polignac number, because 396868868681 - 2²⁶ = 396801759817 is a prime.

It is a super-2 number, since 2×396868868681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (396868868611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198434434340 + 198434434341.

It is an arithmetic number, because the mean of its divisors is an integer number (198434434341).

Almost surely, 2^396868868681 is an apocalyptic number.

It is an amenable number.

396868868681 is a deficient number, since it is larger than the sum of its proper divisors (1).

396868868681 is an equidigital number, since it uses as much as digits as its factorization.

396868868681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1146617856, while the sum is 77.

The spelling of 396868868681 in words is "three hundred ninety-six billion, eight hundred sixty-eight million, eight hundred sixty-eight thousand, six hundred eighty-one".