25245197549 has 16 divisors (see below), whose sum is σ = 29748352704. Its totient is φ = 21120739200.

The previous prime is 25245197543. The next prime is 25245197597. The reversal of 25245197549 is 94579154252.

It is a de Polignac number, because none of the positive numbers 2^k-25245197549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25245197549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25245197543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219344 + ... + 314009.

It is an arithmetic number, because the mean of its divisors is an integer number (1859272044).

Almost surely, 2^25245197549 is an apocalyptic number.

It is an amenable number.

25245197549 is a deficient number, since it is larger than the sum of its proper divisors (4503155155).

25245197549 is a wasteful number, since it uses less digits than its factorization.

25245197549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533708.

The product of its digits is 4536000, while the sum is 53.

The spelling of 25245197549 in words is "twenty-five billion, two hundred forty-five million, one hundred ninety-seven thousand, five hundred forty-nine".