869437537681 has 2 divisors, whose sum is σ = 869437537682. Its totient is φ = 869437537680.

The previous prime is 869437537649. The next prime is 869437537691. The reversal of 869437537681 is 186735734968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 751593633025 + 117843904656 = 866945^2 + 343284^2 .

It is a cyclic number.

It is not a de Polignac number, because 869437537681 - 2⁵ = 869437537649 is a prime.

It is a super-2 number, since 2×869437537681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (869437537621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434718768840 + 434718768841.

It is an arithmetic number, because the mean of its divisors is an integer number (434718768841).

Almost surely, 2^869437537681 is an apocalyptic number.

It is an amenable number.

869437537681 is a deficient number, since it is larger than the sum of its proper divisors (1).

869437537681 is an equidigital number, since it uses as much as digits as its factorization.

869437537681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 182891520, while the sum is 67.

The spelling of 869437537681 in words is "eight hundred sixty-nine billion, four hundred thirty-seven million, five hundred thirty-seven thousand, six hundred eighty-one".