8661433977 has 32 divisors (see below), whose sum is σ = 14689536000. Its totient is φ = 4941063504.

The previous prime is 8661433939. The next prime is 8661433997. The reversal of 8661433977 is 7793341668.

8661433977 is a `hidden beast` number, since 86 + 61 + 433 + 9 + 77 = 666.

It is not a de Polignac number, because 8661433977 - 2⁷ = 8661433849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8661433927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74958 + ... + 151464.

It is an arithmetic number, because the mean of its divisors is an integer number (459048000).

Almost surely, 2^8661433977 is an apocalyptic number.

It is an amenable number.

8661433977 is a deficient number, since it is larger than the sum of its proper divisors (6028102023).

8661433977 is a wasteful number, since it uses less digits than its factorization.

8661433977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77122 (or 77116 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 8661433977 is about 93066.8253299746. The cubic root of 8661433977 is about 2053.6665674281. Note that the first 3 decimals are identical.

The spelling of 8661433977 in words is "eight billion, six hundred sixty-one million, four hundred thirty-three thousand, nine hundred seventy-seven".