400611663153561 has 16 divisors (see below), whose sum is σ = 540179003403648. Its totient is φ = 264064723622400.

The previous prime is 400611663153529. The next prime is 400611663153589. The reversal of 400611663153561 is 165351366116004.

It is not a de Polignac number, because 400611663153561 - 2⁵ = 400611663153529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400611663153561.

It is not an unprimeable number, because it can be changed into a prime (400611663153161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 667339350 + ... + 667939391.

It is an arithmetic number, because the mean of its divisors is an integer number (33761187712728).

Almost surely, 2^{400611663153561} is an apocalyptic number.

It is an amenable number.

400611663153561 is a deficient number, since it is larger than the sum of its proper divisors (139567340250087).

400611663153561 is a wasteful number, since it uses less digits than its factorization.

400611663153561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335279872.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 400611663153561 in words is "four hundred trillion, six hundred eleven billion, six hundred sixty-three million, one hundred fifty-three thousand, five hundred sixty-one".