2644625553 has 16 divisors (see below), whose sum is σ = 3739783680. Its totient is φ = 1656619776.

The previous prime is 2644625549. The next prime is 2644625573. The reversal of 2644625553 is 3555264462.

It is not a de Polignac number, because 2644625553 - 2² = 2644625549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2644625513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11758 + ... + 73671.

It is an arithmetic number, because the mean of its divisors is an integer number (233736480).

Almost surely, 2^2644625553 is an apocalyptic number.

It is an amenable number.

2644625553 is a deficient number, since it is larger than the sum of its proper divisors (1095158127).

2644625553 is a wasteful number, since it uses less digits than its factorization.

2644625553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86056.

The product of its digits is 864000, while the sum is 42.

The square root of 2644625553 is about 51425.9229669240. The cubic root of 2644625553 is about 1382.8913601100.

The spelling of 2644625553 in words is "two billion, six hundred forty-four million, six hundred twenty-five thousand, five hundred fifty-three".