656395542 has 64 divisors (see below), whose sum is σ = 1594321920. Its totient is φ = 198525600.

The previous prime is 656395501. The next prime is 656395547. The reversal of 656395542 is 245593656.

656395542 is a `hidden beast` number, since 6 + 5 + 639 + 5 + 5 + 4 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656395547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 540528 + ... + 541740.

It is an arithmetic number, because the mean of its divisors is an integer number (24911280).

Almost surely, 2^656395542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656395542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797160960).

656395542 is an abundant number, since it is smaller than the sum of its proper divisors (937926378).

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

656395542 is a wasteful number, since it uses less digits than its factorization.

656395542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146 (or 2140 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 656395542 is about 25620.2174463840. The cubic root of 656395542 is about 869.0708987422.

The spelling of 656395542 in words is "six hundred fifty-six million, three hundred ninety-five thousand, five hundred forty-two".