2621665313 has 2 divisors, whose sum is σ = 2621665314. Its totient is φ = 2621665312.

The previous prime is 2621665297. The next prime is 2621665357. The reversal of 2621665313 is 3135661262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2493703969 + 127961344 = 49937^2 + 11312^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621665313 - 2⁴ = 2621665297 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621665393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310832656 + 1310832657.

It is an arithmetic number, because the mean of its divisors is an integer number (1310832657).

Almost surely, 2^2621665313 is an apocalyptic number.

It is an amenable number.

2621665313 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621665313 is an equidigital number, since it uses as much as digits as its factorization.

2621665313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 2621665313 is about 51202.2002749882. The cubic root of 2621665313 is about 1378.8777042438.

The spelling of 2621665313 in words is "two billion, six hundred twenty-one million, six hundred sixty-five thousand, three hundred thirteen".