2156165254633 has 4 divisors (see below), whose sum is σ = 2322024120388. Its totient is φ = 1990306388880.

The previous prime is 2156165254603. The next prime is 2156165254657. The reversal of 2156165254633 is 3364525616512.

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 105435285264 + 2050729969369 = 324708^2 + 1432037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156165254633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156165254603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82929432858 + ... + 82929432883.

It is an arithmetic number, because the mean of its divisors is an integer number (580506030097).

Almost surely, 2^{2156165254633} is an apocalyptic number.

It is an amenable number.

2156165254633 is a deficient number, since it is larger than the sum of its proper divisors (165858865755).

2156165254633 is a wasteful number, since it uses less digits than its factorization.

2156165254633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165858865754.

The product of its digits is 3888000, while the sum is 49.

The spelling of 2156165254633 in words is "two trillion, one hundred fifty-six billion, one hundred sixty-five million, two hundred fifty-four thousand, six hundred thirty-three".