25530198786 has 16 divisors (see below), whose sum is σ = 56733775200. Its totient is φ = 8510066244.

The previous prime is 25530198773. The next prime is 25530198809. The reversal of 25530198786 is 68789103552.

25530198786 is a `hidden beast` number, since 2 + 553 + 0 + 1 + 9 + 8 + 7 + 86 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 472781459 = 25530198786 / (2 + 5 + 5 + 3 + 0 + 1 + 9 + 8 + 7 + 8 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236390676 + ... + 236390783.

It is an arithmetic number, because the mean of its divisors is an integer number (3545860950).

Almost surely, 2^25530198786 is an apocalyptic number.

25530198786 is an abundant number, since it is smaller than the sum of its proper divisors (31203576414).

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

25530198786 is a wasteful number, since it uses less digits than its factorization.

25530198786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472781470 (or 472781464 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 25530198786 in words is "twenty-five billion, five hundred thirty million, one hundred ninety-eight thousand, seven hundred eighty-six".