666240253451 has 2 divisors, whose sum is σ = 666240253452. Its totient is φ = 666240253450.

The previous prime is 666240253417. The next prime is 666240253457. The reversal of 666240253451 is 154352042666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666240253451 - 2³⁴ = 649060384267 is a prime.

It is not a weakly prime, because it can be changed into another prime (666240253457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333120126725 + 333120126726.

It is an arithmetic number, because the mean of its divisors is an integer number (333120126726).

Almost surely, 2^666240253451 is an apocalyptic number.

666240253451 is a deficient number, since it is larger than the sum of its proper divisors (1).

666240253451 is an equidigital number, since it uses as much as digits as its factorization.

666240253451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 666240253451 in words is "six hundred sixty-six billion, two hundred forty million, two hundred fifty-three thousand, four hundred fifty-one".