661924692 has 108 divisors (see below), whose sum is σ = 1980776980. Its totient is φ = 185137920.

The previous prime is 661924687. The next prime is 661924721. The reversal of 661924692 is 296429166.

661924692 is a `hidden beast` number, since 6 + 619 + 24 + 6 + 9 + 2 = 666.

661924692 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 429484176 + 232440516 = 20724^2 + 15246^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50784 + ... + 62472.

Almost surely, 2^661924692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661924692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990388490).

661924692 is an abundant number, since it is smaller than the sum of its proper divisors (1318852288).

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

661924692 is a wasteful number, since it uses less digits than its factorization.

661924692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11734 (or 11718 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 661924692 is about 25727.8971546452. The cubic root of 661924692 is about 871.5042861178.

The spelling of 661924692 in words is "six hundred sixty-one million, nine hundred twenty-four thousand, six hundred ninety-two".