661994300 has 36 divisors (see below), whose sum is σ = 1567123656. Its totient is φ = 240724800.

The previous prime is 661994279. The next prime is 661994309. The reversal of 661994300 is 3499166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661994309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299807 + ... + 302006.

Almost surely, 2^661994300 is an apocalyptic number.

It is an amenable number.

661994300 is an abundant number, since it is smaller than the sum of its proper divisors (905129356).

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

661994300 is a wasteful number, since it uses less digits than its factorization.

661994300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601838 (or 601831 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 661994300 is about 25729.2498919032. The cubic root of 661994300 is about 871.5348341770.

The spelling of 661994300 in words is "six hundred sixty-one million, nine hundred ninety-four thousand, three hundred".