2156990453930 has 128 divisors (see below), whose sum is σ = 4358731668480. Its totient is φ = 763065676800.

The previous prime is 2156990453921. The next prime is 2156990453941. The reversal of 2156990453930 is 393540996512.

It is a happy number.

It is a Curzon 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, 271281455 + ... + 271289405.

It is an arithmetic number, because the mean of its divisors is an integer number (34052591160).

Almost surely, 2^{2156990453930} is an apocalyptic number.

2156990453930 is an abundant number, since it is smaller than the sum of its proper divisors (2201741214550).

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

2156990453930 is a wasteful number, since it uses less digits than its factorization.

2156990453930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8544.

The product of its (nonzero) digits is 7873200, while the sum is 56.

The spelling of 2156990453930 in words is "two trillion, one hundred fifty-six billion, nine hundred ninety million, four hundred fifty-three thousand, nine hundred thirty".