25028215987 has 2 divisors, whose sum is σ = 25028215988. Its totient is φ = 25028215986.

The previous prime is 25028215973. The next prime is 25028216029. The reversal of 25028215987 is 78951282052.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25028215987 - 2²³ = 25019827379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25028215987.

It is not a weakly prime, because it can be changed into another prime (25028215957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12514107993 + 12514107994.

It is an arithmetic number, because the mean of its divisors is an integer number (12514107994).

Almost surely, 2^25028215987 is an apocalyptic number.

25028215987 is a deficient number, since it is larger than the sum of its proper divisors (1).

25028215987 is an equidigital number, since it uses as much as digits as its factorization.

25028215987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 25028215987 in words is "twenty-five billion, twenty-eight million, two hundred fifteen thousand, nine hundred eighty-seven".