66020004640 has 48 divisors (see below), whose sum is σ = 156006640440. Its totient is φ = 26402181120.

The previous prime is 66020004593. The next prime is 66020004641. The reversal of 66020004640 is 4640002066.

66020004640 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 22717724176 + 43302280464 = 150724^2 + 208092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66020004599 and 66020004608.

It is not an unprimeable number, because it can be changed into a prime (66020004641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723160 + ... + 809320.

Almost surely, 2^66020004640 is an apocalyptic number.

It is an amenable number.

66020004640 is an abundant number, since it is smaller than the sum of its proper divisors (89986635800).

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

66020004640 is a wasteful number, since it uses less digits than its factorization.

66020004640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90965 (or 90957 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 66020004640 in words is "sixty-six billion, twenty million, four thousand, six hundred forty".