25433046640 has 20 divisors (see below), whose sum is σ = 59131833624. Its totient is φ = 10173218624.

The previous prime is 25433046623. The next prime is 25433046671. The reversal of 25433046640 is 4664033452.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×25433046640² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25433046640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158956462 + ... + 158956621.

Almost surely, 2^25433046640 is an apocalyptic number.

25433046640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25433046640 is an abundant number, since it is smaller than the sum of its proper divisors (33698786984).

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

25433046640 is a wasteful number, since it uses less digits than its factorization.

25433046640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317913096 (or 317913090 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 37.

The spelling of 25433046640 in words is "twenty-five billion, four hundred thirty-three million, forty-six thousand, six hundred forty".