2638665201 has 32 divisors (see below), whose sum is σ = 3706053120. Its totient is φ = 1668328704.

The previous prime is 2638665193. The next prime is 2638665257. The reversal of 2638665201 is 1025668362.

It is not a de Polignac number, because 2638665201 - 2³ = 2638665193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2638665201.

It is not an unprimeable number, because it can be changed into a prime (2638665301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 629625 + ... + 633801.

It is an arithmetic number, because the mean of its divisors is an integer number (115814160).

Almost surely, 2^2638665201 is an apocalyptic number.

It is an amenable number.

2638665201 is a deficient number, since it is larger than the sum of its proper divisors (1067387919).

2638665201 is a wasteful number, since it uses less digits than its factorization.

2638665201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 2638665201 is about 51367.9394272342. The cubic root of 2638665201 is about 1381.8516767844.

The spelling of 2638665201 in words is "two billion, six hundred thirty-eight million, six hundred sixty-five thousand, two hundred one".