66683297778 has 16 divisors (see below), whose sum is σ = 133471048320. Its totient is φ = 22210357136.

The previous prime is 66683297687. The next prime is 66683297819. The reversal of 66683297778 is 87779238666.

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, 4343898 + ... + 4359221.

It is an arithmetic number, because the mean of its divisors is an integer number (8341940520).

Almost surely, 2^66683297778 is an apocalyptic number.

66683297778 is an abundant number, since it is smaller than the sum of its proper divisors (66787750542).

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

66683297778 is a wasteful number, since it uses less digits than its factorization.

66683297778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704401.

The product of its digits is 256048128, while the sum is 69.

The spelling of 66683297778 in words is "sixty-six billion, six hundred eighty-three million, two hundred ninety-seven thousand, seven hundred seventy-eight".