1638607080738 has 16 divisors (see below), whose sum is σ = 3302231065056. Its totient is φ = 542032876320.

The previous prime is 1638607080713. The next prime is 1638607080739. The reversal of 1638607080738 is 8370807068361.

It is not an unprimeable number, because it can be changed into a prime (1638607080739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1042370131 + ... + 1042371702.

It is an arithmetic number, because the mean of its divisors is an integer number (206389441566).

Almost surely, 2^{1638607080738} is an apocalyptic number.

1638607080738 is an abundant number, since it is smaller than the sum of its proper divisors (1663623984318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1638607080738 is a wasteful number, since it uses less digits than its factorization.

1638607080738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084741969.

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 1638607080738 in words is "one trillion, six hundred thirty-eight billion, six hundred seven million, eighty thousand, seven hundred thirty-eight".