31866506541 has 28 divisors (see below), whose sum is σ = 47792710368. Its totient is φ = 21237754824.

The previous prime is 31866506533. The next prime is 31866506557. The reversal of 31866506541 is 14560566813.

31866506541 is a `hidden beast` number, since 31 + 8 + 66 + 506 + 54 + 1 = 666.

It is not a de Polignac number, because 31866506541 - 2³ = 31866506533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31866506501) 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 27 ways as a sum of consecutive naturals, for example, 3861766 + ... + 3870008.

Almost surely, 2^31866506541 is an apocalyptic number.

It is an amenable number.

31866506541 is a deficient number, since it is larger than the sum of its proper divisors (15926203827).

31866506541 is an frugal number, since it uses more digits than its factorization.

31866506541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13564 (or 13549 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 31866506541 in words is "thirty-one billion, eight hundred sixty-six million, five hundred six thousand, five hundred forty-one".