31661660153 has 2 divisors, whose sum is σ = 31661660154. Its totient is φ = 31661660152.

The previous prime is 31661660143. The next prime is 31661660171. The reversal of 31661660153 is 35106616613.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31658373184 + 3286969 = 177928^2 + 1813^2 .

It is an emirp because it is prime and its reverse (35106616613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31661660153 - 2²² = 31657465849 is a prime.

It is not a weakly prime, because it can be changed into another prime (31661660143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15830830076 + 15830830077.

It is an arithmetic number, because the mean of its divisors is an integer number (15830830077).

Almost surely, 2^31661660153 is an apocalyptic number.

It is an amenable number.

31661660153 is a deficient number, since it is larger than the sum of its proper divisors (1).

31661660153 is an equidigital number, since it uses as much as digits as its factorization.

31661660153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 31661660153 in words is "thirty-one billion, six hundred sixty-one million, six hundred sixty thousand, one hundred fifty-three".