816680999770 has 32 divisors (see below), whose sum is σ = 1592695545408. Its totient is φ = 300306225408.

The previous prime is 816680999767. The next prime is 816680999777. The reversal of 816680999770 is 77999086618.

It is a self number, because there is not a number n which added to its sum of digits gives 816680999770.

It is not an unprimeable number, because it can be changed into a prime (816680999777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55853224 + ... + 55867843.

It is an arithmetic number, because the mean of its divisors is an integer number (49771735794).

Almost surely, 2^816680999770 is an apocalyptic number.

816680999770 is a deficient number, since it is larger than the sum of its proper divisors (776014545638).

816680999770 is a wasteful number, since it uses less digits than its factorization.

816680999770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111721134.

The product of its (nonzero) digits is 82301184, while the sum is 70.

The spelling of 816680999770 in words is "eight hundred sixteen billion, six hundred eighty million, nine hundred ninety-nine thousand, seven hundred seventy".