63840297387 has 18 divisors (see below), whose sum is σ = 90432551604. Its totient is φ = 40051989120.

The previous prime is 63840297383. The next prime is 63840297413. The reversal of 63840297387 is 78379204836.

It is not a de Polignac number, because 63840297387 - 2² = 63840297383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63840297383) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7435437 + ... + 7444017.

Almost surely, 2^63840297387 is an apocalyptic number.

63840297387 is a deficient number, since it is larger than the sum of its proper divisors (26592254217).

63840297387 is an frugal number, since it uses more digits than its factorization.

63840297387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17199 (or 8601 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 57.

The spelling of 63840297387 in words is "sixty-three billion, eight hundred forty million, two hundred ninety-seven thousand, three hundred eighty-seven".