402066665 has 96 divisors (see below), whose sum is σ = 668532480. Its totient is φ = 225815040.

The previous prime is 402066653. The next prime is 402066689. The reversal of 402066665 is 566660204.

402066665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 402066665 - 2⁶ = 402066601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3688631 + ... + 3688739.

It is an arithmetic number, because the mean of its divisors is an integer number (6963880).

Almost surely, 2^402066665 is an apocalyptic number.

It is an amenable number.

402066665 is a deficient number, since it is larger than the sum of its proper divisors (266465815).

402066665 is a wasteful number, since it uses less digits than its factorization.

402066665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 402066665 is about 20051.6000608430. The cubic root of 402066665 is about 738.0730637386.

The spelling of 402066665 in words is "four hundred two million, sixty-six thousand, six hundred sixty-five".