661676076 has 18 divisors (see below), whose sum is σ = 1672570172. Its totient is φ = 220558680.

The previous prime is 661676047. The next prime is 661676137. The reversal of 661676076 is 670676166.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9189910 + ... + 9189981.

Almost surely, 2^661676076 is an apocalyptic number.

It is an amenable number.

661676076 is an abundant number, since it is smaller than the sum of its proper divisors (1010894096).

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

661676076 is a wasteful number, since it uses less digits than its factorization.

661676076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18379901 (or 18379896 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 661676076 is about 25723.0650584257. The cubic root of 661676076 is about 871.3951613968.

The spelling of 661676076 in words is "six hundred sixty-one million, six hundred seventy-six thousand, seventy-six".