40128686631 has 32 divisors (see below), whose sum is σ = 65212842240. Its totient is φ = 24186016800.

The previous prime is 40128686617. The next prime is 40128686671. The reversal of 40128686631 is 13668682104.

40128686631 is a `hidden beast` number, since 4 + 0 + 1 + 2 + 8 + 6 + 8 + 6 + 631 = 666.

It is not a de Polignac number, because 40128686631 - 2¹³ = 40128678439 is a prime.

It is a super-2 number, since 2×40128686631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128686671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319485 + ... + 426998.

It is an arithmetic number, because the mean of its divisors is an integer number (2037901320).

Almost surely, 2^40128686631 is an apocalyptic number.

40128686631 is a deficient number, since it is larger than the sum of its proper divisors (25084155609).

40128686631 is a wasteful number, since it uses less digits than its factorization.

40128686631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746684 (or 746678 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 40128686631 in words is "forty billion, one hundred twenty-eight million, six hundred eighty-six thousand, six hundred thirty-one".