66113251 has 2 divisors, whose sum is σ = 66113252. Its totient is φ = 66113250.

The previous prime is 66113239. The next prime is 66113261. The reversal of 66113251 is 15231166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66113251 - 2⁵ = 66113219 is a prime.

It is not a weakly prime, because it can be changed into another prime (66113261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33056625 + 33056626.

It is an arithmetic number, because the mean of its divisors is an integer number (33056626).

Almost surely, 2^66113251 is an apocalyptic number.

66113251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66113251 is an equidigital number, since it uses as much as digits as its factorization.

66113251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 66113251 is about 8131.0055343727. The cubic root of 66113251 is about 404.3550187009.

The spelling of 66113251 in words is "sixty-six million, one hundred thirteen thousand, two hundred fifty-one".