638147719455 has 64 divisors (see below), whose sum is σ = 1067517480960. Its totient is φ = 325145779200.

The previous prime is 638147719427. The next prime is 638147719459. The reversal of 638147719455 is 554917741836.

It is not a de Polignac number, because 638147719455 - 2⁷ = 638147719327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638147719459) 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, 26598565 + ... + 26622545.

It is an arithmetic number, because the mean of its divisors is an integer number (16679960640).

Almost surely, 2^638147719455 is an apocalyptic number.

638147719455 is a deficient number, since it is larger than the sum of its proper divisors (429369761505).

638147719455 is a wasteful number, since it uses less digits than its factorization.

638147719455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24752.

The product of its digits is 25401600, while the sum is 60.

The spelling of 638147719455 in words is "six hundred thirty-eight billion, one hundred forty-seven million, seven hundred nineteen thousand, four hundred fifty-five".