400855179965 has 4 divisors (see below), whose sum is σ = 481026215964. Its totient is φ = 320684143968.

The previous prime is 400855179961. The next prime is 400855179983. The reversal of 400855179965 is 569971558004.

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 241109478841 + 159745701124 = 491029^2 + 399682^2 .

It is a cyclic number.

It is not a de Polignac number, because 400855179965 - 2² = 400855179961 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400855179961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40085517992 + ... + 40085518001.

It is an arithmetic number, because the mean of its divisors is an integer number (120256553991).

Almost surely, 2^400855179965 is an apocalyptic number.

It is an amenable number.

400855179965 is a deficient number, since it is larger than the sum of its proper divisors (80171035999).

400855179965 is an equidigital number, since it uses as much as digits as its factorization.

400855179965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80171035998.

The product of its (nonzero) digits is 13608000, while the sum is 59.

The spelling of 400855179965 in words is "four hundred billion, eight hundred fifty-five million, one hundred seventy-nine thousand, nine hundred sixty-five".