66695050880 has 64 divisors (see below), whose sum is σ = 159987479400. Its totient is φ = 26586894336.

The previous prime is 66695050867. The next prime is 66695050949. The reversal of 66695050880 is 8805059666.

It is a happy number.

66695050880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 66469089856 + 225961024 = 257816^2 + 15032^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9686 + ... + 365354.

Almost surely, 2^66695050880 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 66695050880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79993739700).

66695050880 is an abundant number, since it is smaller than the sum of its proper divisors (93292428520).

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

66695050880 is a wasteful number, since it uses less digits than its factorization.

66695050880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355981 (or 355969 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 66695050880 in words is "sixty-six billion, six hundred ninety-five million, fifty thousand, eight hundred eighty".