66666688888874 has 16 divisors (see below), whose sum is σ = 106015728454656. Its totient is φ = 31386235395600.

The previous prime is 66666688888873. The next prime is 66666688888901. The reversal of 66666688888874 is 47888888666666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66666688888873) 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, 14530662242 + ... + 14530666829.

It is an arithmetic number, because the mean of its divisors is an integer number (6625983028416).

Almost surely, 2^{66666688888874} is an apocalyptic number.

66666688888874 is a deficient number, since it is larger than the sum of its proper divisors (39349039565782).

66666688888874 is a wasteful number, since it uses less digits than its factorization.

66666688888874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29061329141.

The product of its digits is 342456532992, while the sum is 95.

The spelling of 66666688888874 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred seventy-four".