66252653321 has 2 divisors, whose sum is σ = 66252653322. Its totient is φ = 66252653320.

The previous prime is 66252653309. The next prime is 66252653353. The reversal of 66252653321 is 12335625266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64333249600 + 1919403721 = 253640^2 + 43811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66252653321 is a prime.

It is a super-2 number, since 2×66252653321² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66252653821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33126326660 + 33126326661.

It is an arithmetic number, because the mean of its divisors is an integer number (33126326661).

Almost surely, 2^66252653321 is an apocalyptic number.

It is an amenable number.

66252653321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66252653321 is an equidigital number, since it uses as much as digits as its factorization.

66252653321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 41.

The spelling of 66252653321 in words is "sixty-six billion, two hundred fifty-two million, six hundred fifty-three thousand, three hundred twenty-one".