25171649912 has 32 divisors (see below), whose sum is σ = 49272300000. Its totient is φ = 12040334208.

The previous prime is 25171649911. The next prime is 25171649963. The reversal of 25171649912 is 21994617152.

It is a super-2 number, since 2×25171649912² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25171649911) 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 7 ways as a sum of consecutive naturals, for example, 472412 + ... + 522987.

It is an arithmetic number, because the mean of its divisors is an integer number (1539759375).

Almost surely, 2^25171649912 is an apocalyptic number.

It is an amenable number.

25171649912 is a deficient number, since it is larger than the sum of its proper divisors (24100650088).

25171649912 is a wasteful number, since it uses less digits than its factorization.

25171649912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995543 (or 995539 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The spelling of 25171649912 in words is "twenty-five billion, one hundred seventy-one million, six hundred forty-nine thousand, nine hundred twelve".