656470747 has 4 divisors (see below), whose sum is σ = 661639936. Its totient is φ = 651301560.

The previous prime is 656470733. The next prime is 656470751. The reversal of 656470747 is 747074656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656470747 - 2²³ = 648082139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656470697 and 656470706.

It is not an unprimeable number, because it can be changed into a prime (656470547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2584404 + ... + 2584657.

It is an arithmetic number, because the mean of its divisors is an integer number (165409984).

Almost surely, 2^656470747 is an apocalyptic number.

656470747 is a deficient number, since it is larger than the sum of its proper divisors (5169189).

656470747 is a wasteful number, since it uses less digits than its factorization.

656470747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5169188.

The product of its (nonzero) digits is 987840, while the sum is 46.

The square root of 656470747 is about 25621.6850929052. The cubic root of 656470747 is about 869.1040880703.

The spelling of 656470747 in words is "six hundred fifty-six million, four hundred seventy thousand, seven hundred forty-seven".