66020000004 has 144 divisors (see below), whose sum is σ = 202452397056. Its totient is φ = 17708544000.

The previous prime is 66020000003. The next prime is 66020000041. The reversal of 66020000004 is 40000002066.

66020000004 is a `hidden beast` number, since 660 + 2 + 0 + 0 + 0 + 0 + 0 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (66020000003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1698669 + ... + 1737099.

It is an arithmetic number, because the mean of its divisors is an integer number (1405919424).

Almost surely, 2^66020000004 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 66020000004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101226198528).

66020000004 is an abundant number, since it is smaller than the sum of its proper divisors (136432397052).

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

66020000004 is a wasteful number, since it uses less digits than its factorization.

66020000004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38866 (or 38861 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The spelling of 66020000004 in words is "sixty-six billion, twenty million, four", and thus it is an aban number.