31661660159 has 8 divisors (see below), whose sum is σ = 31730829312. Its totient is φ = 31592567160.

The previous prime is 31661660153. The next prime is 31661660171. The reversal of 31661660159 is 95106616613.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31661660159 - 2⁴ = 31661660143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661660153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856754 + ... + 892944.

It is an arithmetic number, because the mean of its divisors is an integer number (3966353664).

Almost surely, 2^31661660159 is an apocalyptic number.

31661660159 is a deficient number, since it is larger than the sum of its proper divisors (69169153).

31661660159 is a wasteful number, since it uses less digits than its factorization.

31661660159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38077.

The product of its (nonzero) digits is 174960, while the sum is 44.

The spelling of 31661660159 in words is "thirty-one billion, six hundred sixty-one million, six hundred sixty thousand, one hundred fifty-nine".