2638468157 has 4 divisors (see below), whose sum is σ = 2841427260. Its totient is φ = 2435509056.

The previous prime is 2638468139. The next prime is 2638468177. The reversal of 2638468157 is 7518648362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179399236 + 2459068921 = 13394^2 + 49589^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638468157 - 2⁸ = 2638467901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638468177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101479532 + ... + 101479557.

It is an arithmetic number, because the mean of its divisors is an integer number (710356815).

Almost surely, 2^2638468157 is an apocalyptic number.

It is an amenable number.

2638468157 is a deficient number, since it is larger than the sum of its proper divisors (202959103).

2638468157 is a wasteful number, since it uses less digits than its factorization.

2638468157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202959102.

The product of its digits is 1935360, while the sum is 50.

The square root of 2638468157 is about 51366.0214246733. The cubic root of 2638468157 is about 1381.8172790442.

The spelling of 2638468157 in words is "two billion, six hundred thirty-eight million, four hundred sixty-eight thousand, one hundred fifty-seven".