638638086747 has 32 divisors (see below), whose sum is σ = 895476384000. Its totient is φ = 404343515520.

The previous prime is 638638086727. The next prime is 638638086803. The reversal of 638638086747 is 747680836836.

It is not a de Polignac number, because 638638086747 - 2⁶ = 638638086683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638638086727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7110097 + ... + 7199357.

It is an arithmetic number, because the mean of its divisors is an integer number (27983637000).

Almost surely, 2^638638086747 is an apocalyptic number.

638638086747 is a deficient number, since it is larger than the sum of its proper divisors (256838297253).

638638086747 is a wasteful number, since it uses less digits than its factorization.

638638086747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90843.

The product of its (nonzero) digits is 195084288, while the sum is 66.

The spelling of 638638086747 in words is "six hundred thirty-eight billion, six hundred thirty-eight million, eighty-six thousand, seven hundred forty-seven".