2638216161 has 12 divisors (see below), whose sum is σ = 4355150592. Its totient is φ = 1507552056.

The previous prime is 2638216153. The next prime is 2638216169. The reversal of 2638216161 is 1616128362.

It is a happy number.

2638216161 is a `hidden beast` number, since 2 + 6 + 38 + 2 + 1 + 616 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2638216153) and next prime (2638216169).

It is not a de Polignac number, because 2638216161 - 2³ = 2638216153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2638216169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20938161 + ... + 20938286.

It is an arithmetic number, because the mean of its divisors is an integer number (362929216).

Almost surely, 2^2638216161 is an apocalyptic number.

2638216161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2638216161 is a deficient number, since it is larger than the sum of its proper divisors (1716934431).

2638216161 is a wasteful number, since it uses less digits than its factorization.

2638216161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41876460 (or 41876457 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 2638216161 is about 51363.5684215963. The cubic root of 2638216161 is about 1381.7732859022.

The spelling of 2638216161 in words is "two billion, six hundred thirty-eight million, two hundred sixteen thousand, one hundred sixty-one".