661886292 has 12 divisors (see below), whose sum is σ = 1544401376. Its totient is φ = 220628760.

The previous prime is 661886287. The next prime is 661886293. The reversal of 661886292 is 292688166.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661886293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27578584 + ... + 27578607.

Almost surely, 2^661886292 is an apocalyptic number.

It is an amenable number.

661886292 is an abundant number, since it is smaller than the sum of its proper divisors (882515084).

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

661886292 is a wasteful number, since it uses less digits than its factorization.

661886292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55157198 (or 55157196 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 661886292 is about 25727.1508721817. The cubic root of 661886292 is about 871.4874330366.

The spelling of 661886292 in words is "six hundred sixty-one million, eight hundred eighty-six thousand, two hundred ninety-two".