1638198197634 has 32 divisors (see below), whose sum is σ = 3317993072640. Its totient is φ = 539133800400.

The previous prime is 1638198197627. The next prime is 1638198197677. The reversal of 1638198197634 is 4367918918361.

It is a super-2 number, since 2×1638198197634² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18142819 + ... + 18232889.

It is an arithmetic number, because the mean of its divisors is an integer number (103687283520).

Almost surely, 2^{1638198197634} is an apocalyptic number.

1638198197634 is an abundant number, since it is smaller than the sum of its proper divisors (1679794875006).

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

1638198197634 is a wasteful number, since it uses less digits than its factorization.

1638198197634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128526.

The product of its digits is 47029248, while the sum is 66.

The spelling of 1638198197634 in words is "one trillion, six hundred thirty-eight billion, one hundred ninety-eight million, one hundred ninety-seven thousand, six hundred thirty-four".