165972650993 has 2 divisors, whose sum is σ = 165972650994. Its totient is φ = 165972650992.

The previous prime is 165972650947. The next prime is 165972651059. The reversal of 165972650993 is 399056279561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148084123489 + 17888527504 = 384817^2 + 133748^2 .

It is a cyclic number.

It is not a de Polignac number, because 165972650993 - 2³² = 161677683697 is a prime.

It is not a weakly prime, because it can be changed into another prime (165972650933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82986325496 + 82986325497.

It is an arithmetic number, because the mean of its divisors is an integer number (82986325497).

Almost surely, 2^165972650993 is an apocalyptic number.

It is an amenable number.

165972650993 is a deficient number, since it is larger than the sum of its proper divisors (1).

165972650993 is an equidigital number, since it uses as much as digits as its factorization.

165972650993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27556200, while the sum is 62.

The spelling of 165972650993 in words is "one hundred sixty-five billion, nine hundred seventy-two million, six hundred fifty thousand, nine hundred ninety-three".