25491623485547 has 2 divisors, whose sum is σ = 25491623485548. Its totient is φ = 25491623485546.

The previous prime is 25491623485499. The next prime is 25491623485567. The reversal of 25491623485547 is 74558432619452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25491623485547 - 2³⁰ = 25490549743723 is a prime.

It is not a weakly prime, because it can be changed into another prime (25491623485567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12745811742773 + 12745811742774.

It is an arithmetic number, because the mean of its divisors is an integer number (12745811742774).

Almost surely, 2^{25491623485547} is an apocalyptic number.

25491623485547 is a deficient number, since it is larger than the sum of its proper divisors (1).

25491623485547 is an equidigital number, since it uses as much as digits as its factorization.

25491623485547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304000, while the sum is 65.

The spelling of 25491623485547 in words is "twenty-five trillion, four hundred ninety-one billion, six hundred twenty-three million, four hundred eighty-five thousand, five hundred forty-seven".