66717854751 has 4 divisors (see below), whose sum is σ = 88957139672. Its totient is φ = 44478569832.

The previous prime is 66717854737. The next prime is 66717854809. The reversal of 66717854751 is 15745871766.

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

It is not a de Polignac number, because 66717854751 - 2⁹ = 66717854239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66717854691 and 66717854700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66717854051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11119642456 + ... + 11119642461.

It is an arithmetic number, because the mean of its divisors is an integer number (22239284918).

Almost surely, 2^66717854751 is an apocalyptic number.

66717854751 is a deficient number, since it is larger than the sum of its proper divisors (22239284921).

66717854751 is a wasteful number, since it uses less digits than its factorization.

66717854751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22239284920.

The product of its digits is 9878400, while the sum is 57.

The spelling of 66717854751 in words is "sixty-six billion, seven hundred seventeen million, eight hundred fifty-four thousand, seven hundred fifty-one".