1666626151 has 2 divisors, whose sum is σ = 1666626152. Its totient is φ = 1666626150.

The previous prime is 1666626133. The next prime is 1666626167. The reversal of 1666626151 is 1516266661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666626151 - 2⁵ = 1666626119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666626191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833313075 + 833313076.

It is an arithmetic number, because the mean of its divisors is an integer number (833313076).

Almost surely, 2^1666626151 is an apocalyptic number.

1666626151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666626151 is an equidigital number, since it uses as much as digits as its factorization.

1666626151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 1666626151 is about 40824.3328298210. The cubic root of 1666626151 is about 1185.6214940919.

The spelling of 1666626151 in words is "one billion, six hundred sixty-six million, six hundred twenty-six thousand, one hundred fifty-one".