31406668385540 has 48 divisors (see below), whose sum is σ = 75395121860352. Its totient is φ = 10765269484416.

The previous prime is 31406668385537. The next prime is 31406668385579. The reversal of 31406668385540 is 4558386660413.

It is a self number, because there is not a number n which added to its sum of digits gives 31406668385540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27895019 + ... + 28999058.

It is an arithmetic number, because the mean of its divisors is an integer number (1570731705424).

Almost surely, 2^{31406668385540} is an apocalyptic number.

It is an amenable number.

31406668385540 is an abundant number, since it is smaller than the sum of its proper divisors (43988453474812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31406668385540 is a wasteful number, since it uses less digits than its factorization.

31406668385540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56898036 (or 56898034 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 59.

The spelling of 31406668385540 in words is "thirty-one trillion, four hundred six billion, six hundred sixty-eight million, three hundred eighty-five thousand, five hundred forty".