38777487491 has 6 divisors (see below), whose sum is σ = 40536769140. Its totient is φ = 37091509268.

The previous prime is 38777487487. The next prime is 38777487493. The reversal of 38777487491 is 19478477783.

It is not a de Polignac number, because 38777487491 - 2² = 38777487487 is a prime.

It is a super-2 number, since 2×38777487491² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38777487493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36651161 + ... + 36652218.

It is an arithmetic number, because the mean of its divisors is an integer number (6756128190).

Almost surely, 2^38777487491 is an apocalyptic number.

38777487491 is a deficient number, since it is larger than the sum of its proper divisors (1759281649).

38777487491 is an equidigital number, since it uses as much as digits as its factorization.

38777487491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73303425 (or 73303402 counting only the distinct ones).

The product of its digits is 66382848, while the sum is 65.

The spelling of 38777487491 in words is "thirty-eight billion, seven hundred seventy-seven million, four hundred eighty-seven thousand, four hundred ninety-one".