66954555812 has 24 divisors (see below), whose sum is σ = 122341193856. Its totient is φ = 32001747008.

The previous prime is 66954555769. The next prime is 66954555839. The reversal of 66954555812 is 21855545966.

It is a happy 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, 78593 + ... + 374280.

It is an arithmetic number, because the mean of its divisors is an integer number (5097549744).

Almost surely, 2^66954555812 is an apocalyptic number.

It is an amenable number.

66954555812 is a deficient number, since it is larger than the sum of its proper divisors (55386638044).

66954555812 is a wasteful number, since it uses less digits than its factorization.

66954555812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454507 (or 454505 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 56.

The spelling of 66954555812 in words is "sixty-six billion, nine hundred fifty-four million, five hundred fifty-five thousand, eight hundred twelve".