656747481 has 8 divisors (see below), whose sum is σ = 943022080. Its totient is φ = 404152272.

The previous prime is 656747477. The next prime is 656747501. The reversal of 656747481 is 184747656.

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

It is not a de Polignac number, because 656747481 - 2² = 656747477 is a prime.

It is a super-2 number, since 2×656747481² = 862634507599690722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 656747481.

It is not an unprimeable number, because it can be changed into a prime (656747401) 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, 8419801 + ... + 8419878.

It is an arithmetic number, because the mean of its divisors is an integer number (117877760).

Almost surely, 2^656747481 is an apocalyptic number.

It is an amenable number.

656747481 is a deficient number, since it is larger than the sum of its proper divisors (286274599).

656747481 is a wasteful number, since it uses less digits than its factorization.

656747481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16839695.

The product of its digits is 1128960, while the sum is 48.

The square root of 656747481 is about 25627.0849103053. The cubic root of 656747481 is about 869.2261939748.

The spelling of 656747481 in words is "six hundred fifty-six million, seven hundred forty-seven thousand, four hundred eighty-one".