2156112046645 has 4 divisors (see below), whose sum is σ = 2587334455980. Its totient is φ = 1724889637312.

The previous prime is 2156112046607. The next prime is 2156112046651. The reversal of 2156112046645 is 5466402116512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 296944345476 + 1859167701169 = 544926^2 + 1363513^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156112046645 - 2¹⁵ = 2156112013877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215611204660 + ... + 215611204669.

It is an arithmetic number, because the mean of its divisors is an integer number (646833613995).

Almost surely, 2^{2156112046645} is an apocalyptic number.

It is an amenable number.

2156112046645 is a deficient number, since it is larger than the sum of its proper divisors (431222409335).

2156112046645 is an equidigital number, since it uses as much as digits as its factorization.

2156112046645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431222409334.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 2156112046645 in words is "two trillion, one hundred fifty-six billion, one hundred twelve million, forty-six thousand, six hundred forty-five".