656220393 has 16 divisors (see below), whose sum is σ = 972572800. Its totient is φ = 437302800.

The previous prime is 656220391. The next prime is 656220403. The reversal of 656220393 is 393022656.

656220393 is a `hidden beast` number, since 6 + 562 + 2 + 0 + 3 + 93 = 666.

It is not a de Polignac number, because 656220393 - 2¹ = 656220391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656220391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130068 + ... + 135018.

It is an arithmetic number, because the mean of its divisors is an integer number (60785800).

Almost surely, 2^656220393 is an apocalyptic number.

It is an amenable number.

656220393 is a deficient number, since it is larger than the sum of its proper divisors (316352407).

656220393 is a wasteful number, since it uses less digits than its factorization.

656220393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9869 (or 9863 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 656220393 is about 25616.7990389119. The cubic root of 656220393 is about 868.9935924891.

The spelling of 656220393 in words is "six hundred fifty-six million, two hundred twenty thousand, three hundred ninety-three".