31380401166 has 16 divisors (see below), whose sum is σ = 63789668688. Its totient is φ = 10288656000.

The previous prime is 31380401161. The next prime is 31380401177. The reversal of 31380401166 is 66110408313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380401161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42869035 + ... + 42869766.

It is an arithmetic number, because the mean of its divisors is an integer number (3986854293).

Almost surely, 2^31380401166 is an apocalyptic number.

31380401166 is an abundant number, since it is smaller than the sum of its proper divisors (32409267522).

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

31380401166 is a wasteful number, since it uses less digits than its factorization.

31380401166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85738867.

The product of its (nonzero) digits is 10368, while the sum is 33.

Adding to 31380401166 its reverse (66110408313), we get a palindrome (97490809479).

The spelling of 31380401166 in words is "thirty-one billion, three hundred eighty million, four hundred one thousand, one hundred sixty-six".