166150661510503 has 2 divisors, whose sum is σ = 166150661510504. Its totient is φ = 166150661510502.

The previous prime is 166150661510501. The next prime is 166150661510507. The reversal of 166150661510503 is 305015166051661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166150661510503 - 2¹ = 166150661510501 is a prime.

Together with 166150661510501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166150661510501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83075330755251 + 83075330755252.

It is an arithmetic number, because the mean of its divisors is an integer number (83075330755252).

Almost surely, 2^{166150661510503} is an apocalyptic number.

166150661510503 is a deficient number, since it is larger than the sum of its proper divisors (1).

166150661510503 is an equidigital number, since it uses as much as digits as its factorization.

166150661510503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 46.

The spelling of 166150661510503 in words is "one hundred sixty-six trillion, one hundred fifty billion, six hundred sixty-one million, five hundred ten thousand, five hundred three".