2156644401 has 8 divisors (see below), whose sum is σ = 2880690624. Its totient is φ = 1435180560.

The previous prime is 2156644387. The next prime is 2156644423. The reversal of 2156644401 is 1044466512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2156644401 - 2⁶ = 2156644337 is a prime.

It is a super-2 number, since 2×2156644401² = 9302230144729297602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2156644471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643645 + ... + 646986.

It is an arithmetic number, because the mean of its divisors is an integer number (360086328).

Almost surely, 2^2156644401 is an apocalyptic number.

It is an amenable number.

2156644401 is a deficient number, since it is larger than the sum of its proper divisors (724046223).

2156644401 is a wasteful number, since it uses less digits than its factorization.

2156644401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291191.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 2156644401 is about 46439.6856255509. The cubic root of 2156644401 is about 1291.9910764447.

The spelling of 2156644401 in words is "two billion, one hundred fifty-six million, six hundred forty-four thousand, four hundred one".