31885272661 has 16 divisors (see below), whose sum is σ = 35375554368. Its totient is φ = 28496188800.

The previous prime is 31885272659. The next prime is 31885272701. The reversal of 31885272661 is 16627258813.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31885272661 - 2¹ = 31885272659 is a prime.

It is a super-2 number, since 2×31885272661² (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 (31885672661) by changing a digit.

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, 181851 + ... + 311191.

It is an arithmetic number, because the mean of its divisors is an integer number (2210972148).

Almost surely, 2^31885272661 is an apocalyptic number.

It is an amenable number.

31885272661 is a deficient number, since it is larger than the sum of its proper divisors (3490281707).

31885272661 is a wasteful number, since it uses less digits than its factorization.

31885272661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129732.

The product of its digits is 967680, while the sum is 49.

The spelling of 31885272661 in words is "thirty-one billion, eight hundred eighty-five million, two hundred seventy-two thousand, six hundred sixty-one".