25851420860 has 48 divisors (see below), whose sum is σ = 58030039872. Its totient is φ = 9649728000.

The previous prime is 25851420853. The next prime is 25851420871. The reversal of 25851420860 is 6802415852.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

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, 666491 + ... + 704210.

It is an arithmetic number, because the mean of its divisors is an integer number (1208959164).

Almost surely, 2^25851420860 is an apocalyptic number.

25851420860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25851420860 is an abundant number, since it is smaller than the sum of its proper divisors (32178619012).

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

25851420860 is a wasteful number, since it uses less digits than its factorization.

25851420860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370774 (or 1370772 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 25851420860 in words is "twenty-five billion, eight hundred fifty-one million, four hundred twenty thousand, eight hundred sixty".