25205312477 has 2 divisors, whose sum is σ = 25205312478. Its totient is φ = 25205312476.

The previous prime is 25205312459. The next prime is 25205312567. The reversal of 25205312477 is 77421350252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17364387076 + 7840925401 = 131774^2 + 88549^2 .

It is a cyclic number.

It is not a de Polignac number, because 25205312477 - 2¹⁸ = 25205050333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25205312477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25405312477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12602656238 + 12602656239.

It is an arithmetic number, because the mean of its divisors is an integer number (12602656239).

Almost surely, 2^25205312477 is an apocalyptic number.

It is an amenable number.

25205312477 is a deficient number, since it is larger than the sum of its proper divisors (1).

25205312477 is an equidigital number, since it uses as much as digits as its factorization.

25205312477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 25205312477 in words is "twenty-five billion, two hundred five million, three hundred twelve thousand, four hundred seventy-seven".