8661392657 has 4 divisors (see below), whose sum is σ = 8665642560. Its totient is φ = 8657142756.

The previous prime is 8661392617. The next prime is 8661392681. The reversal of 8661392657 is 7562931668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8661392657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8661392599 and 8661392608.

It is not an unprimeable number, because it can be changed into a prime (8661392617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2121893 + ... + 2125970.

It is an arithmetic number, because the mean of its divisors is an integer number (2166410640).

Almost surely, 2^8661392657 is an apocalyptic number.

It is an amenable number.

8661392657 is a deficient number, since it is larger than the sum of its proper divisors (4249903).

8661392657 is a wasteful number, since it uses less digits than its factorization.

8661392657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249902.

The product of its digits is 3265920, while the sum is 53.

The square root of 8661392657 is about 93066.6033386843. The cubic root of 8661392657 is about 2053.6633017011.

The spelling of 8661392657 in words is "eight billion, six hundred sixty-one million, three hundred ninety-two thousand, six hundred fifty-seven".