2638774161 has 9 divisors (see below), whose sum is σ = 3811785289. Its totient is φ = 1759080036.

The previous prime is 2638774141. The next prime is 2638774189. The reversal of 2638774161 is 1614778362.

The square root of 2638774161 is 51369.

It is a perfect power (a square), and thus also a powerful number.

2638774161 is a `hidden beast` number, since 2 + 638 + 7 + 7 + 4 + 1 + 6 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 2638774161 - 2²¹ = 2636677009 is a prime.

It is a super-2 number, since 2×2638774161² = 13926258145522507842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638774111) 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 8 ways as a sum of consecutive naturals, for example, 145546 + ... + 162668.

Almost surely, 2^2638774161 is an apocalyptic number.

2638774161 is the 51369-th square number.

2638774161 is the 25685-th centered octagonal number.

It is an amenable number.

2638774161 is a deficient number, since it is larger than the sum of its proper divisors (1173011128).

2638774161 is an frugal number, since it uses more digits than its factorization.

2638774161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34252 (or 17126 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The cubic root of 2638774161 is about 1381.8706970686.

The spelling of 2638774161 in words is "two billion, six hundred thirty-eight million, seven hundred seventy-four thousand, one hundred sixty-one".