869660917831 has 4 divisors (see below), whose sum is σ = 869717305912. Its totient is φ = 869604529752.

The previous prime is 869660917799. The next prime is 869660917841. The reversal of 869660917831 is 138719066968.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 869660917831 - 2⁵ = 869660917799 is a prime.

It is a super-2 number, since 2×869660917831² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869660917841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28170900 + ... + 28201753.

It is an arithmetic number, because the mean of its divisors is an integer number (217429326478).

Almost surely, 2^869660917831 is an apocalyptic number.

869660917831 is a deficient number, since it is larger than the sum of its proper divisors (56388081).

869660917831 is a wasteful number, since it uses less digits than its factorization.

869660917831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56388080.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 869660917831 in words is "eight hundred sixty-nine billion, six hundred sixty million, nine hundred seventeen thousand, eight hundred thirty-one".