66651104052 has 36 divisors (see below), whose sum is σ = 181439117860. Its totient is φ = 20508031872.

The previous prime is 66651104041. The next prime is 66651104083. The reversal of 66651104052 is 25040115666.

66651104052 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 2 ways, for example, as 14792883876 + 51858220176 = 121626^2 + 227724^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66651103998 and 66651104016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71207977 + ... + 71208912.

Almost surely, 2^66651104052 is an apocalyptic number.

It is an amenable number.

66651104052 is an abundant number, since it is smaller than the sum of its proper divisors (114788013808).

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

66651104052 is a wasteful number, since it uses less digits than its factorization.

66651104052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142416912 (or 142416907 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 66651104052 in words is "sixty-six billion, six hundred fifty-one million, one hundred four thousand, fifty-two".