2638877645 has 4 divisors (see below), whose sum is σ = 3166653180. Its totient is φ = 2111102112.

The previous prime is 2638877639. The next prime is 2638877663. The reversal of 2638877645 is 5467788362.

2638877645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5467788362 = 2 ⋅2733894181.

It can be written as a sum of positive squares in 2 ways, for example, as 295736809 + 2343140836 = 17197^2 + 48406^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638877645 - 2⁸ = 2638877389 is a prime.

It is a super-3 number, since 3×2638877645³ (a number of 29 digits) contains 333 as substring.

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, 263887760 + ... + 263887769.

It is an arithmetic number, because the mean of its divisors is an integer number (791663295).

Almost surely, 2^2638877645 is an apocalyptic number.

It is an amenable number.

2638877645 is a deficient number, since it is larger than the sum of its proper divisors (527775535).

2638877645 is an equidigital number, since it uses as much as digits as its factorization.

2638877645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527775534.

The product of its digits is 13547520, while the sum is 56.

The square root of 2638877645 is about 51370.0072513135. The cubic root of 2638877645 is about 1381.8887609661. Note that the first 3 decimals are identical.

The spelling of 2638877645 in words is "two billion, six hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred forty-five".