2505644164 has 6 divisors (see below), whose sum is σ = 4384877294. Its totient is φ = 1252822080.

The previous prime is 2505644137. The next prime is 2505644177. The reversal of 2505644164 is 4614465052.

It can be written as a sum of positive squares in only one way, i.e., 1366041600 + 1139602564 = 36960^2 + 33758^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313205517 + ... + 313205524.

Almost surely, 2^2505644164 is an apocalyptic number.

It is an amenable number.

2505644164 is a deficient number, since it is larger than the sum of its proper divisors (1879233130).

2505644164 is a wasteful number, since it uses less digits than its factorization.

2505644164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626411045 (or 626411043 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 2505644164 is about 50056.4098193228. The cubic root of 2505644164 is about 1358.2294151655.

The spelling of 2505644164 in words is "two billion, five hundred five million, six hundred forty-four thousand, one hundred sixty-four".