64320690451 has 2 divisors, whose sum is σ = 64320690452. Its totient is φ = 64320690450.

The previous prime is 64320690439. The next prime is 64320690491. The reversal of 64320690451 is 15409602346.

It is an a-pointer prime, because the next prime (64320690491) can be obtained adding 64320690451 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64320690451 - 2³⁵ = 29960952083 is a prime.

It is not a weakly prime, because it can be changed into another prime (64320690491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32160345225 + 32160345226.

It is an arithmetic number, because the mean of its divisors is an integer number (32160345226).

Almost surely, 2^64320690451 is an apocalyptic number.

64320690451 is a deficient number, since it is larger than the sum of its proper divisors (1).

64320690451 is an equidigital number, since it uses as much as digits as its factorization.

64320690451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 64320690451 in words is "sixty-four billion, three hundred twenty million, six hundred ninety thousand, four hundred fifty-one".