665440374 has 16 divisors (see below), whose sum is σ = 1331861040. Its totient is φ = 221650080.

The previous prime is 665440289. The next prime is 665440381. The reversal of 665440374 is 473044566.

It is a happy number.

It is a congruent number.

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, 31869 + ... + 48440.

It is an arithmetic number, because the mean of its divisors is an integer number (83241315).

Almost surely, 2^665440374 is an apocalyptic number.

665440374 is an abundant number, since it is smaller than the sum of its proper divisors (666420666).

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

665440374 is a wasteful number, since it uses less digits than its factorization.

665440374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81695.

The product of its (nonzero) digits is 241920, while the sum is 39.

The square root of 665440374 is about 25796.1309889681. The cubic root of 665440374 is about 873.0445033202.

The spelling of 665440374 in words is "six hundred sixty-five million, four hundred forty thousand, three hundred seventy-four".