66801046775 has 12 divisors (see below), whose sum is σ = 82848608064. Its totient is φ = 53430960000.

The previous prime is 66801046771. The next prime is 66801046903. The reversal of 66801046775 is 57764010866.

It is not a de Polignac number, because 66801046775 - 2² = 66801046771 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 (66801046771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107426 + ... + 380975.

It is an arithmetic number, because the mean of its divisors is an integer number (6904050672).

Almost surely, 2^66801046775 is an apocalyptic number.

66801046775 is a deficient number, since it is larger than the sum of its proper divisors (16047561289).

66801046775 is a wasteful number, since it uses less digits than its factorization.

66801046775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493882 (or 493877 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 66801046775 in words is "sixty-six billion, eight hundred one million, forty-six thousand, seven hundred seventy-five".