18772777649997 has 40 divisors (see below), whose sum is σ = 32050442743616. Its totient is φ = 10726975499328.

The previous prime is 18772777649981. The next prime is 18772777650007. The reversal of 18772777649997 is 79994677727781.

18772777649997 is a `hidden beast` number, since 1 + 8 + 7 + 7 + 27 + 7 + 7 + 6 + 499 + 97 = 666.

It is not a de Polignac number, because 18772777649997 - 2⁴ = 18772777649981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772777649957) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18824238 + ... + 19796400.

Almost surely, 2^{18772777649997} is an apocalyptic number.

It is an amenable number.

18772777649997 is a deficient number, since it is larger than the sum of its proper divisors (13277665093619).

18772777649997 is an equidigital number, since it uses as much as digits as its factorization.

18772777649997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006239 (or 1006230 counting only the distinct ones).

The product of its digits is 32934190464, while the sum is 90.

The spelling of 18772777649997 in words is "eighteen trillion, seven hundred seventy-two billion, seven hundred seventy-seven million, six hundred forty-nine thousand, nine hundred ninety-seven".