66695084928 has 144 divisors (see below), whose sum is σ = 195132436200. Its totient is φ = 21865835520.

The previous prime is 66695084921. The next prime is 66695084933. The reversal of 66695084928 is 82948059666.

66695084928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66695084921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4278813 + ... + 4294371.

Almost surely, 2^66695084928 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 66695084928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97566218100).

66695084928 is an abundant number, since it is smaller than the sum of its proper divisors (128437351272).

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

66695084928 is a wasteful number, since it uses less digits than its factorization.

66695084928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15701 (or 15625 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 66695084928 in words is "sixty-six billion, six hundred ninety-five million, eighty-four thousand, nine hundred twenty-eight".