2156444444501 has 4 divisors (see below), whose sum is σ = 2192994350400. Its totient is φ = 2119894538604.

The previous prime is 2156444444449. The next prime is 2156444444503. The reversal of 2156444444501 is 1054444446512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156444444501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156444444503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18274952861 + ... + 18274952978.

It is an arithmetic number, because the mean of its divisors is an integer number (548248587600).

Almost surely, 2^{2156444444501} is an apocalyptic number.

It is an amenable number.

2156444444501 is a deficient number, since it is larger than the sum of its proper divisors (36549905899).

2156444444501 is an equidigital number, since it uses as much as digits as its factorization.

2156444444501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36549905898.

The product of its (nonzero) digits is 1228800, while the sum is 44.

The spelling of 2156444444501 in words is "two trillion, one hundred fifty-six billion, four hundred forty-four million, four hundred forty-four thousand, five hundred one".