66785588558766 has 48 divisors (see below), whose sum is σ = 180407823643008. Its totient is φ = 17346906118800.

The previous prime is 66785588558761. The next prime is 66785588558789.

66785588558766 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66785588558761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24092923780 + ... + 24092926551.

It is an arithmetic number, because the mean of its divisors is an integer number (3758496325896).

Almost surely, 2^{66785588558766} is an apocalyptic number.

66785588558766 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66785588558766 is an abundant number, since it is smaller than the sum of its proper divisors (113622235084242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66785588558766 is a wasteful number, since it uses less digits than its factorization.

66785588558766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48185850357 (or 48185850354 counting only the distinct ones).

The product of its digits is 162570240000, while the sum is 90.

The spelling of 66785588558766 in words is "sixty-six trillion, seven hundred eighty-five billion, five hundred eighty-eight million, five hundred fifty-eight thousand, seven hundred sixty-six".