31666687153 has 2 divisors, whose sum is σ = 31666687154. Its totient is φ = 31666687152.

The previous prime is 31666687051. The next prime is 31666687181. The reversal of 31666687153 is 35178666613.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16581197824 + 15085489329 = 128768^2 + 122823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31666687153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31666687153.

It is not a weakly prime, because it can be changed into another prime (31666987153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15833343576 + 15833343577.

It is an arithmetic number, because the mean of its divisors is an integer number (15833343577).

Almost surely, 2^31666687153 is an apocalyptic number.

It is an amenable number.

31666687153 is a deficient number, since it is larger than the sum of its proper divisors (1).

31666687153 is an equidigital number, since it uses as much as digits as its factorization.

31666687153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 52.

The spelling of 31666687153 in words is "thirty-one billion, six hundred sixty-six million, six hundred eighty-seven thousand, one hundred fifty-three".