2638877641 has 4 divisors (see below), whose sum is σ = 2639178000. Its totient is φ = 2638577284.

The previous prime is 2638877639. The next prime is 2638877663. The reversal of 2638877641 is 1467788362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1467788362 = 2 ⋅733894181.

It is a cyclic number.

It is not a de Polignac number, because 2638877641 - 2¹ = 2638877639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638877671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136591 + ... + 154708.

It is an arithmetic number, because the mean of its divisors is an integer number (659794500).

Almost surely, 2^2638877641 is an apocalyptic number.

It is an amenable number.

2638877641 is a deficient number, since it is larger than the sum of its proper divisors (300359).

2638877641 is an equidigital number, since it uses as much as digits as its factorization.

2638877641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300358.

The product of its digits is 2709504, while the sum is 52.

The square root of 2638877641 is about 51370.0072123803. The cubic root of 2638877641 is about 1381.8887602679. Note that the first 3 decimals are identical.

The spelling of 2638877641 in words is "two billion, six hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred forty-one".