1638739189560 has 128 divisors (see below), whose sum is σ = 5384015827200. Its totient is φ = 395724226560.

The previous prime is 1638739189523. The next prime is 1638739189561. The reversal of 1638739189560 is 659819378361.

It is a super-2 number, since 2×1638739189560² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 1638739189491 and 1638739189500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638739189561) 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, 2076070 + ... + 2754549.

It is an arithmetic number, because the mean of its divisors is an integer number (42062623650).

Almost surely, 2^{1638739189560} is an apocalyptic number.

1638739189560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638739189560 is an abundant number, since it is smaller than the sum of its proper divisors (3745276637640).

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

1638739189560 is a wasteful number, since it uses less digits than its factorization.

1638739189560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830901 (or 4830897 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 66.

The spelling of 1638739189560 in words is "one trillion, six hundred thirty-eight billion, seven hundred thirty-nine million, one hundred eighty-nine thousand, five hundred sixty".