66671599412 has 24 divisors (see below), whose sum is σ = 133981206240. Its totient is φ = 28710257760.

The previous prime is 66671599399. The next prime is 66671599429. The reversal of 66671599412 is 21499517666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39874523 + ... + 39876194.

It is an arithmetic number, because the mean of its divisors is an integer number (5582550260).

Almost surely, 2^66671599412 is an apocalyptic number.

It is an amenable number.

66671599412 is an abundant number, since it is smaller than the sum of its proper divisors (67309606828).

66671599412 is a wasteful number, since it uses less digits than its factorization.

66671599412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79750751 (or 79750749 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 56.

The spelling of 66671599412 in words is "sixty-six billion, six hundred seventy-one million, five hundred ninety-nine thousand, four hundred twelve".