656571942 has 96 divisors (see below), whose sum is σ = 1640620800. Its totient is φ = 188070336.

The previous prime is 656571941. The next prime is 656571947. The reversal of 656571942 is 249175656.

656571942 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 (656571941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261063 + ... + 263565.

It is an arithmetic number, because the mean of its divisors is an integer number (17089800).

Almost surely, 2^656571942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656571942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820310400).

656571942 is an abundant number, since it is smaller than the sum of its proper divisors (984048858).

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

656571942 is a wasteful number, since it uses less digits than its factorization.

656571942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2602 (or 2599 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 656571942 is about 25623.6598088563. The cubic root of 656571942 is about 869.1487432561.

The spelling of 656571942 in words is "six hundred fifty-six million, five hundred seventy-one thousand, nine hundred forty-two".