2157898957056 has 432 divisors, whose sum is σ = 7034854095360. Its totient is φ = 632547901440.

The previous prime is 2157898957043. The next prime is 2157898957103. The reversal of 2157898957056 is 6507598987512.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35181391 + ... + 35242673.

It is an arithmetic number, because the mean of its divisors is an integer number (16284384480).

Almost surely, 2^{2157898957056} 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 2157898957056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3517427047680).

2157898957056 is an abundant number, since it is smaller than the sum of its proper divisors (4876955138304).

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

2157898957056 is a wasteful number, since it uses less digits than its factorization.

2157898957056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61382 (or 61365 counting only the distinct ones).

The product of its (nonzero) digits is 381024000, while the sum is 72.

The spelling of 2157898957056 in words is "two trillion, one hundred fifty-seven billion, eight hundred ninety-eight million, nine hundred fifty-seven thousand, fifty-six".