25217811949 has 24 divisors (see below), whose sum is σ = 28522882080. Its totient is φ = 22266219360.

The previous prime is 25217811937. The next prime is 25217811979. The reversal of 25217811949 is 94911871252.

It is a de Polignac number, because none of the positive numbers 2^k-25217811949 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25217811979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 917799 + ... + 944875.

It is an arithmetic number, because the mean of its divisors is an integer number (1188453420).

Almost surely, 2^25217811949 is an apocalyptic number.

It is an amenable number.

25217811949 is a deficient number, since it is larger than the sum of its proper divisors (3305070131).

25217811949 is a wasteful number, since it uses less digits than its factorization.

25217811949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27321 (or 27310 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The spelling of 25217811949 in words is "twenty-five billion, two hundred seventeen million, eight hundred eleven thousand, nine hundred forty-nine".