66969977826 has 16 divisors (see below), whose sum is σ = 134273975328. Its totient is φ = 22267656000.

The previous prime is 66969977819. The next prime is 66969977831. The reversal of 66969977826 is 62877996966.

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, 13914880 + ... + 13919691.

It is an arithmetic number, because the mean of its divisors is an integer number (8392123458).

Almost surely, 2^66969977826 is an apocalyptic number.

66969977826 is an abundant number, since it is smaller than the sum of its proper divisors (67303997502).

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

66969977826 is a wasteful number, since it uses less digits than its factorization.

66969977826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27834977.

The product of its digits is 740710656, while the sum is 75.

The spelling of 66969977826 in words is "sixty-six billion, nine hundred sixty-nine million, nine hundred seventy-seven thousand, eight hundred twenty-six".