66677889901 has 4 divisors (see below), whose sum is σ = 76203302752. Its totient is φ = 57152477052.

The previous prime is 66677889899. The next prime is 66677889947. The reversal of 66677889901 is 10998877666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66677889901 - 2¹ = 66677889899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677889961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4762706415 + ... + 4762706428.

It is an arithmetic number, because the mean of its divisors is an integer number (19050825688).

Almost surely, 2^66677889901 is an apocalyptic number.

It is an amenable number.

66677889901 is a deficient number, since it is larger than the sum of its proper divisors (9525412851).

66677889901 is an equidigital number, since it uses as much as digits as its factorization.

66677889901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9525412850.

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 66677889901 in words is "sixty-six billion, six hundred seventy-seven million, eight hundred eighty-nine thousand, nine hundred one".