66954555806 has 4 divisors (see below), whose sum is σ = 100431833712. Its totient is φ = 33477277902.

The previous prime is 66954555769. The next prime is 66954555839. The reversal of 66954555806 is 60855545966.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16738638950 + ... + 16738638953.

It is an arithmetic number, because the mean of its divisors is an integer number (25107958428).

Almost surely, 2^66954555806 is an apocalyptic number.

66954555806 is a deficient number, since it is larger than the sum of its proper divisors (33477277906).

66954555806 is a wasteful number, since it uses less digits than its factorization.

66954555806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33477277905.

The product of its (nonzero) digits is 38880000, while the sum is 59.

The spelling of 66954555806 in words is "sixty-six billion, nine hundred fifty-four million, five hundred fifty-five thousand, eight hundred six".