18638147677 has 8 divisors (see below), whose sum is σ = 19154759256. Its totient is φ = 18122213952.

The previous prime is 18638147653. The next prime is 18638147699. The reversal of 18638147677 is 77674183681.

It can be written as a sum of positive squares in 4 ways, for example, as 14336230756 + 4301916921 = 119734^2 + 65589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18638147677 - 2²⁷ = 18503929949 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 (18638147777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113458 + ... + 223939.

It is an arithmetic number, because the mean of its divisors is an integer number (2394344907).

Almost surely, 2^18638147677 is an apocalyptic number.

It is an amenable number.

18638147677 is a deficient number, since it is larger than the sum of its proper divisors (516611579).

18638147677 is a wasteful number, since it uses less digits than its factorization.

18638147677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338927.

The product of its digits is 9483264, while the sum is 58.

The spelling of 18638147677 in words is "eighteen billion, six hundred thirty-eight million, one hundred forty-seven thousand, six hundred seventy-seven".