66602251 has 2 divisors, whose sum is σ = 66602252. Its totient is φ = 66602250.

The previous prime is 66602233. The next prime is 66602269. The reversal of 66602251 is 15220666.

66602251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (66602233) and next prime (66602269).

It is a cyclic number.

It is not a de Polignac number, because 66602251 - 2¹⁷ = 66471179 is a prime.

It is not a weakly prime, because it can be changed into another prime (66602281) 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, 33301125 + 33301126.

It is an arithmetic number, because the mean of its divisors is an integer number (33301126).

Almost surely, 2^66602251 is an apocalyptic number.

66602251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66602251 is an equidigital number, since it uses as much as digits as its factorization.

66602251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66602251 is about 8161.0202180855. The cubic root of 66602251 is about 405.3494945879.

It can be divided in two parts, 6660 and 2251, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 66602251 in words is "sixty-six million, six hundred two thousand, two hundred fifty-one".