25620646423 has 2 divisors, whose sum is σ = 25620646424. Its totient is φ = 25620646422.

The previous prime is 25620646397. The next prime is 25620646451. The reversal of 25620646423 is 32464602652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25620646423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25620646453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810323211 + 12810323212.

It is an arithmetic number, because the mean of its divisors is an integer number (12810323212).

Almost surely, 2^25620646423 is an apocalyptic number.

25620646423 is a deficient number, since it is larger than the sum of its proper divisors (1).

25620646423 is an equidigital number, since it uses as much as digits as its factorization.

25620646423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 40.

The spelling of 25620646423 in words is "twenty-five billion, six hundred twenty million, six hundred forty-six thousand, four hundred twenty-three".