66061253 has 2 divisors, whose sum is σ = 66061254. Its totient is φ = 66061252.

The previous prime is 66061223. The next prime is 66061321. The reversal of 66061253 is 35216066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53684929 + 12376324 = 7327^2 + 3518^2 .

It is a cyclic number.

It is not a de Polignac number, because 66061253 - 2⁶ = 66061189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66061223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33030626 + 33030627.

It is an arithmetic number, because the mean of its divisors is an integer number (33030627).

Almost surely, 2^66061253 is an apocalyptic number.

It is an amenable number.

66061253 is a deficient number, since it is larger than the sum of its proper divisors (1).

66061253 is an equidigital number, since it uses as much as digits as its factorization.

66061253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66061253 is about 8127.8073919108. The cubic root of 66061253 is about 404.2489826362.

The spelling of 66061253 in words is "sixty-six million, sixty-one thousand, two hundred fifty-three".