2156450056440 has 256 divisors, whose sum is σ = 7021567969920. Its totient is φ = 527680143360.

The previous prime is 2156450056433. The next prime is 2156450056487. The reversal of 2156450056440 is 446500546512.

It is a junction number, because it is equal to n+sod(n) for n = 2156450056392 and 2156450056401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 141929484 + ... + 141944676.

Almost surely, 2^{2156450056440} is an apocalyptic number.

2156450056440 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 2156450056440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3510783984960).

2156450056440 is an abundant number, since it is smaller than the sum of its proper divisors (4865117913480).

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

2156450056440 is a wasteful number, since it uses less digits than its factorization.

2156450056440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16962 (or 16958 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 2156450056440 in words is "two trillion, one hundred fifty-six billion, four hundred fifty million, fifty-six thousand, four hundred forty".