25135550443 has 2 divisors, whose sum is σ = 25135550444. Its totient is φ = 25135550442.

The previous prime is 25135550359. The next prime is 25135550459. The reversal of 25135550443 is 34405553152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25135550443 - 2²¹ = 25133453291 is a prime.

It is not a weakly prime, because it can be changed into another prime (25135559443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12567775221 + 12567775222.

It is an arithmetic number, because the mean of its divisors is an integer number (12567775222).

Almost surely, 2^25135550443 is an apocalyptic number.

25135550443 is a deficient number, since it is larger than the sum of its proper divisors (1).

25135550443 is an equidigital number, since it uses as much as digits as its factorization.

25135550443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180000, while the sum is 37.

The spelling of 25135550443 in words is "twenty-five billion, one hundred thirty-five million, five hundred fifty thousand, four hundred forty-three".