656140542 has 16 divisors (see below), whose sum is σ = 1324321680. Its totient is φ = 216706752.

The previous prime is 656140519. The next prime is 656140543. The reversal of 656140542 is 245041656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656140543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500983 + ... + 502290.

It is an arithmetic number, because the mean of its divisors is an integer number (82770105).

Almost surely, 2^656140542 is an apocalyptic number.

656140542 is an abundant number, since it is smaller than the sum of its proper divisors (668181138).

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

656140542 is a wasteful number, since it uses less digits than its factorization.

656140542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003387.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 656140542 is about 25615.2404244036. The cubic root of 656140542 is about 868.9583437511.

The spelling of 656140542 in words is "six hundred fifty-six million, one hundred forty thousand, five hundred forty-two".