400344356665 has 8 divisors (see below), whose sum is σ = 524087157888. Its totient is φ = 291159532080.

The previous prime is 400344356641. The next prime is 400344356683. The reversal of 400344356665 is 566653443004.

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

It is not a de Polignac number, because 400344356665 - 2⁷ = 400344356537 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, 3639494097 + ... + 3639494206.

It is an arithmetic number, because the mean of its divisors is an integer number (65510894736).

Almost surely, 2^400344356665 is an apocalyptic number.

It is an amenable number.

400344356665 is a deficient number, since it is larger than the sum of its proper divisors (123742801223).

400344356665 is a wasteful number, since it uses less digits than its factorization.

400344356665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278988319.

The product of its (nonzero) digits is 3110400, while the sum is 46.

Adding to 400344356665 its reverse (566653443004), we get a palindrome (966997799669).

The spelling of 400344356665 in words is "four hundred billion, three hundred forty-four million, three hundred fifty-six thousand, six hundred sixty-five".