166953015517 has 2 divisors, whose sum is σ = 166953015518. Its totient is φ = 166953015516.

The previous prime is 166953015499. The next prime is 166953015553. The reversal of 166953015517 is 715510359661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164370241476 + 2582774041 = 405426^2 + 50821^2 .

It is a cyclic number.

It is not a de Polignac number, because 166953015517 - 2¹⁹ = 166952491229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166953015577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83476507758 + 83476507759.

It is an arithmetic number, because the mean of its divisors is an integer number (83476507759).

Almost surely, 2^166953015517 is an apocalyptic number.

It is an amenable number.

166953015517 is a deficient number, since it is larger than the sum of its proper divisors (1).

166953015517 is an equidigital number, since it uses as much as digits as its factorization.

166953015517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 850500, while the sum is 49.

The spelling of 166953015517 in words is "one hundred sixty-six billion, nine hundred fifty-three million, fifteen thousand, five hundred seventeen".