638718051147 has 64 divisors (see below), whose sum is σ = 969831014400. Its totient is φ = 370468010880.

The previous prime is 638718051053. The next prime is 638718051149. The reversal of 638718051147 is 741150817836.

It is not a de Polignac number, because 638718051147 - 2⁷ = 638718051019 is a prime.

It is a super-2 number, since 2×638718051147² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638718051147.

It is not an unprimeable number, because it can be changed into a prime (638718051149) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58813804 + ... + 58824662.

It is an arithmetic number, because the mean of its divisors is an integer number (15153609600).

Almost surely, 2^638718051147 is an apocalyptic number.

638718051147 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

638718051147 is a deficient number, since it is larger than the sum of its proper divisors (331112963253).

638718051147 is a wasteful number, since it uses less digits than its factorization.

638718051147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11696.

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 638718051147 in words is "six hundred thirty-eight billion, seven hundred eighteen million, fifty-one thousand, one hundred forty-seven".