66806246064 has 40 divisors (see below), whose sum is σ = 173900244672. Its totient is φ = 22098756160.

The previous prime is 66806246011. The next prime is 66806246099. The reversal of 66806246064 is 46064260866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 5305914 + ... + 5318489.

Almost surely, 2^66806246064 is an apocalyptic number.

It is an amenable number.

66806246064 is an abundant number, since it is smaller than the sum of its proper divisors (107093998608).

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

66806246064 is a wasteful number, since it uses less digits than its factorization.

66806246064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10624545 (or 10624539 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 66806246064 in words is "sixty-six billion, eight hundred six million, two hundred forty-six thousand, sixty-four".