400565166665 has 8 divisors (see below), whose sum is σ = 480710142528. Its totient is φ = 320430838320.

The previous prime is 400565166641. The next prime is 400565166679. The reversal of 400565166665 is 566661565004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400565166665 - 2⁸ = 400565166409 is a prime.

It is a Duffinian 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, 2578877 + ... + 2729786.

It is an arithmetic number, because the mean of its divisors is an integer number (60088767816).

Almost surely, 2^400565166665 is an apocalyptic number.

It is an amenable number.

400565166665 is a deficient number, since it is larger than the sum of its proper divisors (80144975863).

400565166665 is a wasteful number, since it uses less digits than its factorization.

400565166665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323759.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 400565166665 in words is "four hundred billion, five hundred sixty-five million, one hundred sixty-six thousand, six hundred sixty-five".