2157558644488 has 128 divisors (see below), whose sum is σ = 4420955750400. Its totient is φ = 981222149376.

The previous prime is 2157558644459. The next prime is 2157558644519. The reversal of 2157558644488 is 8844468557512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1416649695 + ... + 1416651217.

It is an arithmetic number, because the mean of its divisors is an integer number (34538716800).

Almost surely, 2^{2157558644488} 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 2157558644488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2210477875200).

2157558644488 is an abundant number, since it is smaller than the sum of its proper divisors (2263397105912).

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

2157558644488 is a wasteful number, since it uses less digits than its factorization.

2157558644488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331 (or 2327 counting only the distinct ones).

The product of its digits is 344064000, while the sum is 67.

The spelling of 2157558644488 in words is "two trillion, one hundred fifty-seven billion, five hundred fifty-eight million, six hundred forty-four thousand, four hundred eighty-eight".