66021700712066 has 32 divisors (see below), whose sum is σ = 108163357967808. Its totient is φ = 29974362341440.

The previous prime is 66021700712047. The next prime is 66021700712081.

66021700712066 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×66021700712066³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114418256 + ... + 114993828.

It is an arithmetic number, because the mean of its divisors is an integer number (3380104936494).

Almost surely, 2^{66021700712066} is an apocalyptic number.

66021700712066 is a deficient number, since it is larger than the sum of its proper divisors (42141657255742).

66021700712066 is a wasteful number, since it uses less digits than its factorization.

66021700712066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581746.

The product of its (nonzero) digits is 254016, while the sum is 44.

It can be divided in two parts, 66021700 and 712066, that added together give a palindrome (66733766).

The spelling of 66021700712066 in words is "sixty-six trillion, twenty-one billion, seven hundred million, seven hundred twelve thousand, sixty-six".