8638149771 has 16 divisors (see below), whose sum is σ = 12816882720. Its totient is φ = 5749935840.

The previous prime is 8638149763. The next prime is 8638149781. The reversal of 8638149771 is 1779418368.

8638149771 is a `hidden beast` number, since 8 + 6 + 3 + 81 + 497 + 71 = 666.

8638149771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8638149771 - 2³ = 8638149763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8638149761) 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 15 ways as a sum of consecutive naturals, for example, 227340 + ... + 262601.

It is an arithmetic number, because the mean of its divisors is an integer number (801055170).

Almost surely, 2^8638149771 is an apocalyptic number.

8638149771 is a deficient number, since it is larger than the sum of its proper divisors (4178732949).

8638149771 is a wasteful number, since it uses less digits than its factorization.

8638149771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490603 (or 490597 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 8638149771 is about 92941.6471287227. The cubic root of 8638149771 is about 2051.8246511530.

The spelling of 8638149771 in words is "eight billion, six hundred thirty-eight million, one hundred forty-nine thousand, seven hundred seventy-one".