66666979000 has 128 divisors (see below), whose sum is σ = 165572035200. Its totient is φ = 25038182400.

The previous prime is 66666978977. The next prime is 66666979003. The reversal of 66666979000 is 97966666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666979003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7458534 + ... + 7467466.

It is an arithmetic number, because the mean of its divisors is an integer number (1293531525).

Almost surely, 2^66666979000 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 66666979000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82786017600).

66666979000 is an abundant number, since it is smaller than the sum of its proper divisors (98905056200).

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

66666979000 is a wasteful number, since it uses less digits than its factorization.

66666979000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410 (or 9396 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 55.

The spelling of 66666979000 in words is "sixty-six billion, six hundred sixty-six million, nine hundred seventy-nine thousand".