816158969655 has 32 divisors (see below), whose sum is σ = 1375199078400. Its totient is φ = 412190393472.

The previous prime is 816158969651. The next prime is 816158969671. The reversal of 816158969655 is 556969851618.

It is not a de Polignac number, because 816158969655 - 2² = 816158969651 is a prime.

It is a super-2 number, since 2×816158969655² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 816158969655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816158969651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2535 + ... + 1277624.

It is an arithmetic number, because the mean of its divisors is an integer number (42974971200).

Almost surely, 2^816158969655 is an apocalyptic number.

816158969655 is a deficient number, since it is larger than the sum of its proper divisors (559040108745).

816158969655 is a wasteful number, since it uses less digits than its factorization.

816158969655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282423.

The product of its digits is 139968000, while the sum is 69.

The spelling of 816158969655 in words is "eight hundred sixteen billion, one hundred fifty-eight million, nine hundred sixty-nine thousand, six hundred fifty-five".