166150661510501 has 2 divisors, whose sum is σ = 166150661510502. Its totient is φ = 166150661510500.

The previous prime is 166150661510359. The next prime is 166150661510503. The reversal of 166150661510501 is 105015166051661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125808728169601 + 40341933340900 = 11216449^2 + 6351530^2 .

It is a cyclic number.

It is not a de Polignac number, because 166150661510501 - 2¹⁴ = 166150661494117 is a prime.

Together with 166150661510503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166150661510503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83075330755250 + 83075330755251.

It is an arithmetic number, because the mean of its divisors is an integer number (83075330755251).

Almost surely, 2^{166150661510501} is an apocalyptic number.

It is an amenable number.

166150661510501 is a deficient number, since it is larger than the sum of its proper divisors (1).

166150661510501 is an equidigital number, since it uses as much as digits as its factorization.

166150661510501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 166150661510501 in words is "one hundred sixty-six trillion, one hundred fifty billion, six hundred sixty-one million, five hundred ten thousand, five hundred one".