2155640531632 has 80 divisors (see below), whose sum is σ = 4836204748800. Its totient is φ = 911664748800.

The previous prime is 2155640531609. The next prime is 2155640531641. The reversal of 2155640531632 is 2361350465512.

It is a super-2 number, since 2×2155640531632² (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, 16755969 + ... + 16884127.

It is an arithmetic number, because the mean of its divisors is an integer number (60452559360).

Almost surely, 2^{2155640531632} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155640531632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2418102374400).

2155640531632 is an abundant number, since it is smaller than the sum of its proper divisors (2680564217168).

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

2155640531632 is a wasteful number, since it uses less digits than its factorization.

2155640531632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130154 (or 130148 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 2155640531632 in words is "two trillion, one hundred fifty-five billion, six hundred forty million, five hundred thirty-one thousand, six hundred thirty-two".