656161240 has 64 divisors (see below), whose sum is σ = 1786536000. Its totient is φ = 211734528.

The previous prime is 656161213. The next prime is 656161249. The reversal of 656161240 is 42161656.

656161240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656161249) 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, 64165 + ... + 73684.

It is an arithmetic number, because the mean of its divisors is an integer number (27914625).

Almost surely, 2^656161240 is an apocalyptic number.

It is an amenable number.

656161240 is an abundant number, since it is smaller than the sum of its proper divisors (1130374760).

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

656161240 is a wasteful number, since it uses less digits than its factorization.

656161240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137884 (or 137880 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 656161240 is about 25615.6444385067. The cubic root of 656161240 is about 868.9674807726.

The spelling of 656161240 in words is "six hundred fifty-six million, one hundred sixty-one thousand, two hundred forty".