25551425064 has 128 divisors (see below), whose sum is σ = 70518988800. Its totient is φ = 7650620160.

The previous prime is 25551425063. The next prime is 25551425069. The reversal of 25551425064 is 46052415552.

It is not an unprimeable number, because it can be changed into a prime (25551425063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17755657 + ... + 17757095.

It is an arithmetic number, because the mean of its divisors is an integer number (550929600).

Almost surely, 2^25551425064 is an apocalyptic number.

25551425064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25551425064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35259494400).

25551425064 is an abundant number, since it is smaller than the sum of its proper divisors (44967563736).

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

25551425064 is a wasteful number, since it uses less digits than its factorization.

25551425064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215 (or 2211 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 25551425064 in words is "twenty-five billion, five hundred fifty-one million, four hundred twenty-five thousand, sixty-four".