2156581960000 has 840 divisors, whose sum is σ = 6147600738048. Its totient is φ = 748800000000.

The previous prime is 2156581959997. The next prime is 2156581960019. The reversal of 2156581960000 is 691856512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 8591959875 + ... + 8591960125.

Almost surely, 2^{2156581960000} is an apocalyptic number.

2156581960000 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 2156581960000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3073800369024).

2156581960000 is an abundant number, since it is smaller than the sum of its proper divisors (3991018778048).

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

2156581960000 is a wasteful number, since it uses less digits than its factorization.

2156581960000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 2156581960000 in words is "two trillion, one hundred fifty-six billion, five hundred eighty-one million, nine hundred sixty thousand".