66003869778 has 32 divisors (see below), whose sum is σ = 164581079040. Its totient is φ = 17143862160.

The previous prime is 66003869773. The next prime is 66003869783. The reversal of 66003869778 is 87796830066.

It is an interprime number because it is at equal distance from previous prime (66003869773) and next prime (66003869783).

It is not an unprimeable number, because it can be changed into a prime (66003869773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71432298 + ... + 71433221.

It is an arithmetic number, because the mean of its divisors is an integer number (5143158720).

Almost surely, 2^66003869778 is an apocalyptic number.

66003869778 is an abundant number, since it is smaller than the sum of its proper divisors (98577209262).

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

66003869778 is a wasteful number, since it uses less digits than its factorization.

66003869778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142865542.

The product of its (nonzero) digits is 18289152, while the sum is 60.

The spelling of 66003869778 in words is "sixty-six billion, three million, eight hundred sixty-nine thousand, seven hundred seventy-eight".