25195921824 has 24 divisors (see below), whose sum is σ = 66139295040. Its totient is φ = 8398640576.

The previous prime is 25195921771. The next prime is 25195921837. The reversal of 25195921824 is 42812959152.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×25195921824² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131228664 + ... + 131228855.

It is an arithmetic number, because the mean of its divisors is an integer number (2755803960).

Almost surely, 2^25195921824 is an apocalyptic number.

25195921824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25195921824 is an abundant number, since it is smaller than the sum of its proper divisors (40943373216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25195921824 is a wasteful number, since it uses less digits than its factorization.

25195921824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262457532 (or 262457524 counting only the distinct ones).

The product of its digits is 518400, while the sum is 48.

The spelling of 25195921824 in words is "twenty-five billion, one hundred ninety-five million, nine hundred twenty-one thousand, eight hundred twenty-four".