166914672521 has 2 divisors, whose sum is σ = 166914672522. Its totient is φ = 166914672520.

The previous prime is 166914672511. The next prime is 166914672541. The reversal of 166914672521 is 125276419661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166545610000 + 369062521 = 408100^2 + 19211^2 .

It is an emirp because it is prime and its reverse (125276419661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166914672521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166914672521.

It is not a weakly prime, because it can be changed into another prime (166914672511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83457336260 + 83457336261.

It is an arithmetic number, because the mean of its divisors is an integer number (83457336261).

Almost surely, 2^166914672521 is an apocalyptic number.

It is an amenable number.

166914672521 is a deficient number, since it is larger than the sum of its proper divisors (1).

166914672521 is an equidigital number, since it uses as much as digits as its factorization.

166914672521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The spelling of 166914672521 in words is "one hundred sixty-six billion, nine hundred fourteen million, six hundred seventy-two thousand, five hundred twenty-one".