661877484 has 24 divisors (see below), whose sum is σ = 1563932160. Its totient is φ = 217832784.

The previous prime is 661877479. The next prime is 661877501. The reversal of 661877484 is 484778166.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348144 + ... + 350039.

It is an arithmetic number, because the mean of its divisors is an integer number (65163840).

Almost surely, 2^661877484 is an apocalyptic number.

It is an amenable number.

661877484 is an abundant number, since it is smaller than the sum of its proper divisors (902054676).

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

661877484 is a wasteful number, since it uses less digits than its factorization.

661877484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698269 (or 698267 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 51.

The square root of 661877484 is about 25726.9796905894. The cubic root of 661877484 is about 871.4835672692.

The spelling of 661877484 in words is "six hundred sixty-one million, eight hundred seventy-seven thousand, four hundred eighty-four".