66025299648 has 224 divisors, whose sum is σ = 218098298880. Its totient is φ = 17125770240.

The previous prime is 66025299617. The next prime is 66025299653. The reversal of 66025299648 is 84699252066.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12401115 + ... + 12406437.

It is an arithmetic number, because the mean of its divisors is an integer number (973653120).

Almost surely, 2^66025299648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66025299648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109049149440).

66025299648 is an abundant number, since it is smaller than the sum of its proper divisors (152072999232).

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

66025299648 is a wasteful number, since it uses less digits than its factorization.

66025299648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6195 (or 6185 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 66025299648 in words is "sixty-six billion, twenty-five million, two hundred ninety-nine thousand, six hundred forty-eight".