25620413491 has 2 divisors, whose sum is σ = 25620413492. Its totient is φ = 25620413490.

The previous prime is 25620413473. The next prime is 25620413521. The reversal of 25620413491 is 19431402652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25620413491 - 2¹³ = 25620405299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25620413491.

It is not a weakly prime, because it can be changed into another prime (25620417491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810206745 + 12810206746.

It is an arithmetic number, because the mean of its divisors is an integer number (12810206746).

Almost surely, 2^25620413491 is an apocalyptic number.

25620413491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25620413491 is an equidigital number, since it uses as much as digits as its factorization.

25620413491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 25620413491 in words is "twenty-five billion, six hundred twenty million, four hundred thirteen thousand, four hundred ninety-one".