66700201985 has 12 divisors (see below), whose sum is σ = 82895428668. Its totient is φ = 51520152768.

The previous prime is 66700201949. The next prime is 66700202039. The reversal of 66700201985 is 58910200766.

It can be written as a sum of positive squares in 6 ways, for example, as 7292476816 + 59407725169 = 85396^2 + 243737^2 .

It is not a de Polignac number, because 66700201985 - 2⁶ = 66700201921 is a prime.

It is a Duffinian 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, 7926854 + ... + 7935263.

It is an arithmetic number, because the mean of its divisors is an integer number (6907952389).

Almost surely, 2^66700201985 is an apocalyptic number.

It is an amenable number.

66700201985 is a deficient number, since it is larger than the sum of its proper divisors (16195226683).

66700201985 is a wasteful number, since it uses less digits than its factorization.

66700201985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15862180 (or 15862151 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 66700201985 in words is "sixty-six billion, seven hundred million, two hundred one thousand, nine hundred eighty-five".