25285781100 has 72 divisors (see below), whose sum is σ = 73982296080. Its totient is φ = 6667105280.

The previous prime is 25285781083. The next prime is 25285781137. The reversal of 25285781100 is 118758252.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 446817 + ... + 500216.

It is an arithmetic number, because the mean of its divisors is an integer number (1027531890).

Almost surely, 2^25285781100 is an apocalyptic number.

25285781100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25285781100 is an abundant number, since it is smaller than the sum of its proper divisors (48696514980).

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

25285781100 is a wasteful number, since it uses less digits than its factorization.

25285781100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947139 (or 947132 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 39.

The spelling of 25285781100 in words is "twenty-five billion, two hundred eighty-five million, seven hundred eighty-one thousand, one hundred".