661974882 has 16 divisors (see below), whose sum is σ = 1324559520. Its totient is φ = 220556672.

The previous prime is 661974869. The next prime is 661974913. The reversal of 661974882 is 288479166.

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, 10632 + ... + 37907.

It is an arithmetic number, because the mean of its divisors is an integer number (82784970).

Almost surely, 2^661974882 is an apocalyptic number.

661974882 is an abundant number, since it is smaller than the sum of its proper divisors (662584638).

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

661974882 is a wasteful number, since it uses less digits than its factorization.

661974882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50817.

The product of its digits is 1161216, while the sum is 51.

The square root of 661974882 is about 25728.8725365104. The cubic root of 661974882 is about 871.5263126389.

The spelling of 661974882 in words is "six hundred sixty-one million, nine hundred seventy-four thousand, eight hundred eighty-two".