400297608665 has 16 divisors (see below), whose sum is σ = 507281298048. Its totient is φ = 302624146176.

The previous prime is 400297608653. The next prime is 400297608721. The reversal of 400297608665 is 566806792004.

It is a cyclic number.

It is not a de Polignac number, because 400297608665 - 2⁸ = 400297608409 is a prime.

It is a super-4 number, since 4×400297608665⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

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, 20959424 + ... + 20978513.

It is an arithmetic number, because the mean of its divisors is an integer number (31705081128).

Almost surely, 2^400297608665 is an apocalyptic number.

It is an amenable number.

400297608665 is a deficient number, since it is larger than the sum of its proper divisors (106983689383).

400297608665 is a wasteful number, since it uses less digits than its factorization.

400297608665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41938048.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 400297608665 in words is "four hundred billion, two hundred ninety-seven million, six hundred eight thousand, six hundred sixty-five".