25491883820 has 48 divisors (see below), whose sum is σ = 58738659840. Its totient is φ = 9234790656.

The previous prime is 25491883799. The next prime is 25491883831. The reversal of 25491883820 is 2838819452.

It is a super-2 number, since 2×25491883820² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911180 + ... + 938739.

It is an arithmetic number, because the mean of its divisors is an integer number (1223722080).

Almost surely, 2^25491883820 is an apocalyptic number.

25491883820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25491883820 is an abundant number, since it is smaller than the sum of its proper divisors (33246776020).

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

25491883820 is a wasteful number, since it uses less digits than its factorization.

25491883820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849994 (or 1849992 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 25491883820 in words is "twenty-five billion, four hundred ninety-one million, eight hundred eighty-three thousand, eight hundred twenty".