664561151 has 2 divisors, whose sum is σ = 664561152. Its totient is φ = 664561150.

The previous prime is 664561133. The next prime is 664561171. The reversal of 664561151 is 151165466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664561151 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664561111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332280575 + 332280576.

It is an arithmetic number, because the mean of its divisors is an integer number (332280576).

Almost surely, 2^664561151 is an apocalyptic number.

664561151 is a deficient number, since it is larger than the sum of its proper divisors (1).

664561151 is an equidigital number, since it uses as much as digits as its factorization.

664561151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 664561151 is about 25779.0835950388. The cubic root of 664561151 is about 872.6598261682.

The spelling of 664561151 in words is "six hundred sixty-four million, five hundred sixty-one thousand, one hundred fifty-one".