660046405 has 4 divisors (see below), whose sum is σ = 792055692. Its totient is φ = 528037120.

The previous prime is 660046379. The next prime is 660046411. The reversal of 660046405 is 504640066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 468029956 + 192016449 = 21634^2 + 13857^2 .

It is a de Polignac number, because none of the positive numbers 2^k-660046405 is a prime.

It is a super-2 number, since 2×660046405² = 871322513506848050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66004636 + ... + 66004645.

It is an arithmetic number, because the mean of its divisors is an integer number (198013923).

Almost surely, 2^660046405 is an apocalyptic number.

It is an amenable number.

660046405 is a deficient number, since it is larger than the sum of its proper divisors (132009287).

660046405 is a wasteful number, since it uses less digits than its factorization.

660046405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132009286.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 660046405 is about 25691.3682975430. The cubic root of 660046405 is about 870.6791741544.

The spelling of 660046405 in words is "six hundred sixty million, forty-six thousand, four hundred five".