25479254077 has 2 divisors, whose sum is σ = 25479254078. Its totient is φ = 25479254076.

The previous prime is 25479254071. The next prime is 25479254081. The reversal of 25479254077 is 77045297452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17492972121 + 7986281956 = 132261^2 + 89366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25479254077 is a prime.

It is a super-2 number, since 2×25479254077² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25479254071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12739627038 + 12739627039.

It is an arithmetic number, because the mean of its divisors is an integer number (12739627039).

Almost surely, 2^25479254077 is an apocalyptic number.

It is an amenable number.

25479254077 is a deficient number, since it is larger than the sum of its proper divisors (1).

25479254077 is an equidigital number, since it uses as much as digits as its factorization.

25479254077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4939200, while the sum is 52.

The spelling of 25479254077 in words is "twenty-five billion, four hundred seventy-nine million, two hundred fifty-four thousand, seventy-seven".