166550263515631 has 2 divisors, whose sum is σ = 166550263515632. Its totient is φ = 166550263515630.

The previous prime is 166550263515619. The next prime is 166550263515653. The reversal of 166550263515631 is 136515362055661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166550263515631 - 2⁴¹ = 164351240260079 is a prime.

It is a super-2 number, since 2×166550263515631² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166550263515931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83275131757815 + 83275131757816.

It is an arithmetic number, because the mean of its divisors is an integer number (83275131757816).

Almost surely, 2^{166550263515631} is an apocalyptic number.

166550263515631 is a deficient number, since it is larger than the sum of its proper divisors (1).

166550263515631 is an equidigital number, since it uses as much as digits as its factorization.

166550263515631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580000, while the sum is 55.

The spelling of 166550263515631 in words is "one hundred sixty-six trillion, five hundred fifty billion, two hundred sixty-three million, five hundred fifteen thousand, six hundred thirty-one".