66425240699 has 2 divisors, whose sum is σ = 66425240700. Its totient is φ = 66425240698.

The previous prime is 66425240659. The next prime is 66425240723. The reversal of 66425240699 is 99604252466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66425240699 - 2²⁴ = 66408463483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66425240699.

It is not a weakly prime, because it can be changed into another prime (66425240659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33212620349 + 33212620350.

It is an arithmetic number, because the mean of its divisors is an integer number (33212620350).

Almost surely, 2^66425240699 is an apocalyptic number.

66425240699 is a deficient number, since it is larger than the sum of its proper divisors (1).

66425240699 is an equidigital number, since it uses as much as digits as its factorization.

66425240699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 66425240699 in words is "sixty-six billion, four hundred twenty-five million, two hundred forty thousand, six hundred ninety-nine".