638132543698 has 16 divisors (see below), whose sum is σ = 1032085106136. Its totient is φ = 294163966080.

The previous prime is 638132543689. The next prime is 638132543729. The reversal of 638132543698 is 896345231836.

It can be written as a sum of positive squares in 4 ways, for example, as 240548068849 + 397584474849 = 490457^2 + 630543^2 .

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, 14926011 + ... + 14968702.

Almost surely, 2^638132543698 is an apocalyptic number.

638132543698 is a deficient number, since it is larger than the sum of its proper divisors (393952562438).

638132543698 is a wasteful number, since it uses less digits than its factorization.

638132543698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29895549.

The product of its digits is 22394880, while the sum is 58.

The spelling of 638132543698 in words is "six hundred thirty-eight billion, one hundred thirty-two million, five hundred forty-three thousand, six hundred ninety-eight".