661161792 has 56 divisors (see below), whose sum is σ = 1752575616. Its totient is φ = 219977728.

The previous prime is 661161751. The next prime is 661161799. The reversal of 661161792 is 297161166.

It is a self number, because there is not a number n which added to its sum of digits gives 661161792.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661161799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110953 + ... + 116759.

Almost surely, 2^661161792 is an apocalyptic number.

It is an amenable number.

661161792 is an abundant number, since it is smaller than the sum of its proper divisors (1091413824).

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

661161792 is a wasteful number, since it uses less digits than its factorization.

661161792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415 (or 6405 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 661161792 is about 25713.0665615753. The cubic root of 661161792 is about 871.1693405551.

The spelling of 661161792 in words is "six hundred sixty-one million, one hundred sixty-one thousand, seven hundred ninety-two".