1661166151 has 2 divisors, whose sum is σ = 1661166152. Its totient is φ = 1661166150.

The previous prime is 1661166149. The next prime is 1661166281. The reversal of 1661166151 is 1516611661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661166151 - 2¹ = 1661166149 is a prime.

It is a super-3 number, since 3×1661166151³ (a number of 29 digits) contains 333 as substring.

Together with 1661166149, 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 (1661166851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830583075 + 830583076.

It is an arithmetic number, because the mean of its divisors is an integer number (830583076).

Almost surely, 2^1661166151 is an apocalyptic number.

1661166151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661166151 is an equidigital number, since it uses as much as digits as its factorization.

1661166151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 1661166151 is about 40757.4060877284. The cubic root of 1661166151 is about 1184.3253474876.

The spelling of 1661166151 in words is "one billion, six hundred sixty-one million, one hundred sixty-six thousand, one hundred fifty-one".