25533461820 has 24 divisors (see below), whose sum is σ = 71493693264. Its totient is φ = 6808923136.

The previous prime is 25533461819. The next prime is 25533461839. The reversal of 25533461820 is 2816433552.

It is a happy number.

It is a congruent number.

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, 212778789 + ... + 212778908.

It is an arithmetic number, because the mean of its divisors is an integer number (2978903886).

Almost surely, 2^25533461820 is an apocalyptic number.

25533461820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25533461820 is an abundant number, since it is smaller than the sum of its proper divisors (45960231444).

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

25533461820 is a wasteful number, since it uses less digits than its factorization.

25533461820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425557709 (or 425557707 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 25533461820 in words is "twenty-five billion, five hundred thirty-three million, four hundred sixty-one thousand, eight hundred twenty".