166550263515931 has 2 divisors, whose sum is σ = 166550263515932. Its totient is φ = 166550263515930.

The previous prime is 166550263515829. The next prime is 166550263515941. The reversal of 166550263515931 is 139515362055661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166550263515931 - 2¹³ = 166550263507739 is a prime.

It is a super-2 number, since 2×166550263515931² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166550263515941) 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, 83275131757965 + 83275131757966.

It is an arithmetic number, because the mean of its divisors is an integer number (83275131757966).

Almost surely, 2^{166550263515931} is an apocalyptic number.

166550263515931 is a deficient number, since it is larger than the sum of its proper divisors (1).

166550263515931 is an equidigital number, since it uses as much as digits as its factorization.

166550263515931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870000, while the sum is 58.

The spelling of 166550263515931 in words is "one hundred sixty-six trillion, five hundred fifty billion, two hundred sixty-three million, five hundred fifteen thousand, nine hundred thirty-one".