2638899531960 has 128 divisors (see below), whose sum is σ = 7987918697280. Its totient is φ = 697401888768.

The previous prime is 2638899531929. The next prime is 2638899531967. The reversal of 2638899531960 is 691359988362.

It is a Cunningham number, because it is equal to 1624469²-1.

It is a super-2 number, since 2×2638899531960² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638899531967) 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, 6294822 + ... + 6700938.

Almost surely, 2^{2638899531960} is an apocalyptic number.

2638899531960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2638899531960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3993959348640).

2638899531960 is an abundant number, since it is smaller than the sum of its proper divisors (5349019165320).

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

2638899531960 is a wasteful number, since it uses less digits than its factorization.

2638899531960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406617 (or 406613 counting only the distinct ones).

The product of its (nonzero) digits is 151165440, while the sum is 69.

The spelling of 2638899531960 in words is "two trillion, six hundred thirty-eight billion, eight hundred ninety-nine million, five hundred thirty-one thousand, nine hundred sixty".