661111074 has 24 divisors (see below), whose sum is σ = 1542593052. Its totient is φ = 203418720.

The previous prime is 661111039. The next prime is 661111081. The reversal of 661111074 is 470111166.

It can be written as a sum of positive squares in 2 ways, for example, as 602358849 + 58752225 = 24543^2 + 7665^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1412397 + ... + 1412864.

Almost surely, 2^661111074 is an apocalyptic number.

661111074 is an abundant number, since it is smaller than the sum of its proper divisors (881481978).

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

661111074 is a wasteful number, since it uses less digits than its factorization.

661111074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825282 (or 2825279 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 661111074 is about 25712.0803125690. The cubic root of 661111074 is about 871.1470640629.

The spelling of 661111074 in words is "six hundred sixty-one million, one hundred eleven thousand, seventy-four".