66177943099 has 4 divisors (see below), whose sum is σ = 66560474736. Its totient is φ = 65795411464.

The previous prime is 66177943063. The next prime is 66177943123. The reversal of 66177943099 is 99034977166.

66177943099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 66177943099 - 2²³ = 66169554491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66177943049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191265559 + ... + 191265904.

It is an arithmetic number, because the mean of its divisors is an integer number (16640118684).

Almost surely, 2^66177943099 is an apocalyptic number.

66177943099 is a deficient number, since it is larger than the sum of its proper divisors (382531637).

66177943099 is a wasteful number, since it uses less digits than its factorization.

66177943099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382531636.

The product of its (nonzero) digits is 15431472, while the sum is 61.

The spelling of 66177943099 in words is "sixty-six billion, one hundred seventy-seven million, nine hundred forty-three thousand, ninety-nine".