666565242 has 32 divisors (see below), whose sum is σ = 1526366592. Its totient is φ = 190098624.

The previous prime is 666565219. The next prime is 666565301. The reversal of 666565242 is 242565666.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 666565194 and 666565203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9148 + ... + 37640.

It is an arithmetic number, because the mean of its divisors is an integer number (47698956).

Almost surely, 2^666565242 is an apocalyptic number.

666565242 is an abundant number, since it is smaller than the sum of its proper divisors (859801350).

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

666565242 is a wasteful number, since it uses less digits than its factorization.

666565242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29062.

The product of its digits is 518400, while the sum is 42.

The square root of 666565242 is about 25817.9248197836. The cubic root of 666565242 is about 873.5361611858.

The spelling of 666565242 in words is "six hundred sixty-six million, five hundred sixty-five thousand, two hundred forty-two".