400665135022131 has 64 divisors (see below), whose sum is σ = 646725298692096. Its totient is φ = 215392457280000.

The previous prime is 400665135022121. The next prime is 400665135022151. The reversal of 400665135022131 is 131220531566004.

It is a happy number.

It is not a de Polignac number, because 400665135022131 - 2¹⁵ = 400665134989363 is a prime.

It is a super-2 number, since 2×400665135022131² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400665135022131.

It is not an unprimeable number, because it can be changed into a prime (400665135022121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14511055516 + ... + 14511083126.

It is an arithmetic number, because the mean of its divisors is an integer number (10105082792064).

Almost surely, 2^{400665135022131} is an apocalyptic number.

400665135022131 is a deficient number, since it is larger than the sum of its proper divisors (246060163669965).

400665135022131 is a wasteful number, since it uses less digits than its factorization.

400665135022131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43392.

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 400665135022131 its reverse (131220531566004), we get a palindrome (531885666588135).

The spelling of 400665135022131 in words is "four hundred trillion, six hundred sixty-five billion, one hundred thirty-five million, twenty-two thousand, one hundred thirty-one".