63940718438 has 16 divisors (see below), whose sum is σ = 98330470560. Its totient is φ = 31165166400.

The previous prime is 63940718423. The next prime is 63940718441. The reversal of 63940718438 is 83481704936.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 63940718438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216458 + ... + 418013.

It is an arithmetic number, because the mean of its divisors is an integer number (6145654410).

Almost surely, 2^63940718438 is an apocalyptic number.

63940718438 is a deficient number, since it is larger than the sum of its proper divisors (34389752122).

63940718438 is a wasteful number, since it uses less digits than its factorization.

63940718438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635743.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 63940718438 in words is "sixty-three billion, nine hundred forty million, seven hundred eighteen thousand, four hundred thirty-eight".