656166720 has 112 divisors (see below), whose sum is σ = 2272759488. Its totient is φ = 159068160.

The previous prime is 656166689. The next prime is 656166751. The reversal of 656166720 is 27661656.

It is an interprime number because it is at equal distance from previous prime (656166689) and next prime (656166751).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20509 + ... + 41628.

Almost surely, 2^656166720 is an apocalyptic number.

656166720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656166720 is an abundant number, since it is smaller than the sum of its proper divisors (1616592768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656166720 is a wasteful number, since it uses less digits than its factorization.

656166720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62168 (or 62158 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 656166720 is about 25615.7514041654. The cubic root of 656166720 is about 868.9698998571.

The spelling of 656166720 in words is "six hundred fifty-six million, one hundred sixty-six thousand, seven hundred twenty".