816169777856 has 28 divisors (see below), whose sum is σ = 1621221324480. Its totient is φ = 407673066240.

The previous prime is 816169777853. The next prime is 816169777859. The reversal of 816169777856 is 658777961618.

It is an interprime number because it is at equal distance from previous prime (816169777853) and next prime (816169777859).

It is a super-2 number, since 2×816169777856² (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 816169777856.

It is not an unprimeable number, because it can be changed into a prime (816169777853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6370811 + ... + 6497658.

Almost surely, 2^816169777856 is an apocalyptic number.

It is an amenable number.

816169777856 is a deficient number, since it is larger than the sum of its proper divisors (805051546624).

816169777856 is a wasteful number, since it uses less digits than its factorization.

816169777856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12869472 (or 12869462 counting only the distinct ones).

The product of its digits is 213373440, while the sum is 71.

The spelling of 816169777856 in words is "eight hundred sixteen billion, one hundred sixty-nine million, seven hundred seventy-seven thousand, eight hundred fifty-six".