656222139 has 6 divisors (see below), whose sum is σ = 947876436. Its totient is φ = 437481420.

The previous prime is 656222137. The next prime is 656222143. The reversal of 656222139 is 931222656.

656222139 is a `hidden beast` number, since 6 + 5 + 622 + 21 + 3 + 9 = 666.

It is not a de Polignac number, because 656222139 - 2¹ = 656222137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656222137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36456777 + ... + 36456794.

It is an arithmetic number, because the mean of its divisors is an integer number (157979406).

Almost surely, 2^656222139 is an apocalyptic number.

656222139 is a deficient number, since it is larger than the sum of its proper divisors (291654297).

656222139 is a wasteful number, since it uses less digits than its factorization.

656222139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72913577 (or 72913574 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 656222139 is about 25616.8331180886. The cubic root of 656222139 is about 868.9943631964.

The spelling of 656222139 in words is "six hundred fifty-six million, two hundred twenty-two thousand, one hundred thirty-nine".