656421345042 has 16 divisors (see below), whose sum is σ = 1314194753952. Its totient is φ = 218581771040.

The previous prime is 656421345011. The next prime is 656421345071. The reversal of 656421345042 is 240543124656.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 656421344985 and 656421345003.

It is an unprimeable number.

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, 56329683 + ... + 56341334.

It is an arithmetic number, because the mean of its divisors is an integer number (82137172122).

Almost surely, 2^656421345042 is an apocalyptic number.

656421345042 is an abundant number, since it is smaller than the sum of its proper divisors (657773408910).

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

656421345042 is a wasteful number, since it uses less digits than its factorization.

656421345042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112671993.

The product of its (nonzero) digits is 691200, while the sum is 42.

Adding to 656421345042 its reverse (240543124656), we get a palindrome (896964469698).

The spelling of 656421345042 in words is "six hundred fifty-six billion, four hundred twenty-one million, three hundred forty-five thousand, forty-two".