66251357 has 2 divisors, whose sum is σ = 66251358. Its totient is φ = 66251356.

The previous prime is 66251299. The next prime is 66251359. The reversal of 66251357 is 75315266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66161956 + 89401 = 8134^2 + 299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66251357 is a prime.

Together with 66251359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66251359) 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, 33125678 + 33125679.

It is an arithmetic number, because the mean of its divisors is an integer number (33125679).

Almost surely, 2^66251357 is an apocalyptic number.

It is an amenable number.

66251357 is a deficient number, since it is larger than the sum of its proper divisors (1).

66251357 is an equidigital number, since it uses as much as digits as its factorization.

66251357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 35.

The square root of 66251357 is about 8139.4936574703. The cubic root of 66251357 is about 404.6363794155.

The spelling of 66251357 in words is "sixty-six million, two hundred fifty-one thousand, three hundred fifty-seven".