25031521650 has 96 divisors (see below), whose sum is σ = 65921584320. Its totient is φ = 6264094720.

The previous prime is 25031521639. The next prime is 25031521693. The reversal of 25031521650 is 5612513052.

It is a happy number.

It is a super-2 number, since 2×25031521650² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon 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 47 ways as a sum of consecutive naturals, for example, 870706 + ... + 898994.

It is an arithmetic number, because the mean of its divisors is an integer number (686683170).

Almost surely, 2^25031521650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25031521650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32960792160).

25031521650 is an abundant number, since it is smaller than the sum of its proper divisors (40890062670).

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

25031521650 is a wasteful number, since it uses less digits than its factorization.

25031521650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28668 (or 28663 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 25031521650 in words is "twenty-five billion, thirty-one million, five hundred twenty-one thousand, six hundred fifty".