8199999999961 has 24 divisors (see below), whose sum is σ = 10633111204352. Its totient is φ = 6183493905600.

The previous prime is 8199999999937. The next prime is 8200000000019. The reversal of 8199999999961 is 1699999999918.

It is not a de Polignac number, because 8199999999961 - 2⁵ = 8199999999929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8199999999161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156122580 + ... + 156175093.

Almost surely, 2^{8199999999961} is an apocalyptic number.

It is an amenable number.

8199999999961 is a deficient number, since it is larger than the sum of its proper divisors (2433111204391).

8199999999961 is a wasteful number, since it uses less digits than its factorization.

8199999999961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312297733 (or 312297722 counting only the distinct ones).

The product of its digits is 18596183472, while the sum is 97.

The spelling of 8199999999961 in words is "eight trillion, one hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-one".