656561847 has 8 divisors (see below), whose sum is σ = 894041856. Its totient is φ = 428394872.

The previous prime is 656561837. The next prime is 656561903. The reversal of 656561847 is 748165656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656561847 - 2⁶ = 656561783 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 656561796 and 656561805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656561837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2328093 + ... + 2328374.

It is an arithmetic number, because the mean of its divisors is an integer number (111755232).

Almost surely, 2^656561847 is an apocalyptic number.

656561847 is a deficient number, since it is larger than the sum of its proper divisors (237480009).

656561847 is a wasteful number, since it uses less digits than its factorization.

656561847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656517.

The product of its digits is 1209600, while the sum is 48.

The square root of 656561847 is about 25623.4628221870. The cubic root of 656561847 is about 869.1442887549.

The spelling of 656561847 in words is "six hundred fifty-six million, five hundred sixty-one thousand, eight hundred forty-seven".