638632733025 has 96 divisors (see below), whose sum is σ = 1217841696000. Its totient is φ = 289263513600.

The previous prime is 638632733023. The next prime is 638632733047. The reversal of 638632733025 is 520337236836.

It is not a de Polignac number, because 638632733025 - 2¹ = 638632733023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638632733023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31984045 + ... + 32004005.

It is an arithmetic number, because the mean of its divisors is an integer number (12685851000).

Almost surely, 2^638632733025 is an apocalyptic number.

It is an amenable number.

638632733025 is a deficient number, since it is larger than the sum of its proper divisors (579208962975).

638632733025 is a wasteful number, since it uses less digits than its factorization.

638632733025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20539 (or 20534 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 48.

The spelling of 638632733025 in words is "six hundred thirty-eight billion, six hundred thirty-two million, seven hundred thirty-three thousand, twenty-five".