25500530550 has 48 divisors (see below), whose sum is σ = 68990530752. Its totient is φ = 6181946400.

The previous prime is 25500530543. The next prime is 25500530557. The reversal of 25500530550 is 5503500552.

It is an interprime number because it is at equal distance from previous prime (25500530543) and next prime (25500530557).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25500530557) 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, 7725784 + ... + 7729083.

It is an arithmetic number, because the mean of its divisors is an integer number (1437302724).

Almost surely, 2^25500530550 is an apocalyptic number.

25500530550 is an abundant number, since it is smaller than the sum of its proper divisors (43490000202).

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

25500530550 is a wasteful number, since it uses less digits than its factorization.

25500530550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15454893 (or 15454888 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 30.

The spelling of 25500530550 in words is "twenty-five billion, five hundred million, five hundred thirty thousand, five hundred fifty".