66201780018 has 32 divisors (see below), whose sum is σ = 152936735040. Its totient is φ = 18881077760.

The previous prime is 66201779999. The next prime is 66201780037. The reversal of 66201780018 is 81008710266.

It is an interprime number because it is at equal distance from previous prime (66201779999) and next prime (66201780037).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29500563 + ... + 29502806.

It is an arithmetic number, because the mean of its divisors is an integer number (4779272970).

Almost surely, 2^66201780018 is an apocalyptic number.

66201780018 is an abundant number, since it is smaller than the sum of its proper divisors (86734955022).

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

66201780018 is a wasteful number, since it uses less digits than its factorization.

66201780018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59003402.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 66201780018 in words is "sixty-six billion, two hundred one million, seven hundred eighty thousand, eighteen".