661425792 has 32 divisors (see below), whose sum is σ = 1756913280. Its totient is φ = 220475136.

The previous prime is 661425773. The next prime is 661425829. The reversal of 661425792 is 297524166.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860848 + ... + 861615.

It is an arithmetic number, because the mean of its divisors is an integer number (54903540).

Almost surely, 2^661425792 is an apocalyptic number.

It is an amenable number.

661425792 is an abundant number, since it is smaller than the sum of its proper divisors (1095487488).

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

661425792 is a wasteful number, since it uses less digits than its factorization.

661425792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722480 (or 1722468 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 661425792 is about 25718.1996259458. The cubic root of 661425792 is about 871.2852769286.

The spelling of 661425792 in words is "six hundred sixty-one million, four hundred twenty-five thousand, seven hundred ninety-two".