1611666151 has 2 divisors, whose sum is σ = 1611666152. Its totient is φ = 1611666150.

The previous prime is 1611666149. The next prime is 1611666157. The reversal of 1611666151 is 1516661161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1611666151 - 2¹ = 1611666149 is a prime.

Together with 1611666149, 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 (1611666157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805833075 + 805833076.

It is an arithmetic number, because the mean of its divisors is an integer number (805833076).

Almost surely, 2^1611666151 is an apocalyptic number.

1611666151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611666151 is an equidigital number, since it uses as much as digits as its factorization.

1611666151 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 1611666151 is about 40145.5620336794. The cubic root of 1611666151 is about 1172.4428835476.

The spelling of 1611666151 in words is "one billion, six hundred eleven million, six hundred sixty-six thousand, one hundred fifty-one".