25540223747 has 2 divisors, whose sum is σ = 25540223748. Its totient is φ = 25540223746.

The previous prime is 25540223741. The next prime is 25540223749. The reversal of 25540223747 is 74732204552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25540223747 is a prime.

Together with 25540223749, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25540223741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12770111873 + 12770111874.

It is an arithmetic number, because the mean of its divisors is an integer number (12770111874).

Almost surely, 2^25540223747 is an apocalyptic number.

25540223747 is a deficient number, since it is larger than the sum of its proper divisors (1).

25540223747 is an equidigital number, since it uses as much as digits as its factorization.

25540223747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470400, while the sum is 41.

The spelling of 25540223747 in words is "twenty-five billion, five hundred forty million, two hundred twenty-three thousand, seven hundred forty-seven".