638132543697 has 16 divisors (see below), whose sum is σ = 937382823360. Its totient is φ = 382917816000.

The previous prime is 638132543689. The next prime is 638132543729. The reversal of 638132543697 is 796345231836.

It is not a de Polignac number, because 638132543697 - 2³ = 638132543689 is a prime.

It is a super-2 number, since 2×638132543697² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638132543647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95726122 + ... + 95732787.

It is an arithmetic number, because the mean of its divisors is an integer number (58586426460).

Almost surely, 2^638132543697 is an apocalyptic number.

It is an amenable number.

638132543697 is a deficient number, since it is larger than the sum of its proper divisors (299250279663).

638132543697 is a wasteful number, since it uses less digits than its factorization.

638132543697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191459024.

The product of its digits is 19595520, while the sum is 57.

The spelling of 638132543697 in words is "six hundred thirty-eight billion, one hundred thirty-two million, five hundred forty-three thousand, six hundred ninety-seven".