25646669064 has 384 divisors, whose sum is σ = 80316835200. Its totient is φ = 7648971264.

The previous prime is 25646669063. The next prime is 25646669077. The reversal of 25646669064 is 46096664652.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 25646669064.

It is not an unprimeable number, because it can be changed into a prime (25646669063) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 157341447 + ... + 157341609.

It is an arithmetic number, because the mean of its divisors is an integer number (209158425).

Almost surely, 2^25646669064 is an apocalyptic number.

25646669064 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 25646669064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40158417600).

25646669064 is an abundant number, since it is smaller than the sum of its proper divisors (54670166136).

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

25646669064 is a wasteful number, since it uses less digits than its factorization.

25646669064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 54.

The spelling of 25646669064 in words is "twenty-five billion, six hundred forty-six million, six hundred sixty-nine thousand, sixty-four".