31665653969 has 2 divisors, whose sum is σ = 31665653970. Its totient is φ = 31665653968.

The previous prime is 31665653947. The next prime is 31665654089. The reversal of 31665653969 is 96935656613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31077106369 + 588547600 = 176287^2 + 24260^2 .

It is a cyclic number.

It is not a de Polignac number, because 31665653969 - 2¹⁶ = 31665588433 is a prime.

It is a super-2 number, since 2×31665653969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31665653909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15832826984 + 15832826985.

It is an arithmetic number, because the mean of its divisors is an integer number (15832826985).

Almost surely, 2^31665653969 is an apocalyptic number.

It is an amenable number.

31665653969 is a deficient number, since it is larger than the sum of its proper divisors (1).

31665653969 is an equidigital number, since it uses as much as digits as its factorization.

31665653969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23619600, while the sum is 59.

The spelling of 31665653969 in words is "thirty-one billion, six hundred sixty-five million, six hundred fifty-three thousand, nine hundred sixty-nine".