66607744770666 has 96 divisors (see below), whose sum is σ = 162525094617600. Its totient is φ = 19531859788800.

The previous prime is 66607744770643. The next prime is 66607744770683.

66607744770666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66607744770594 and 66607744770603.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101865666 + ... + 102517458.

It is an arithmetic number, because the mean of its divisors is an integer number (1692969735600).

Almost surely, 2^{66607744770666} is an apocalyptic number.

66607744770666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66607744770666 is an abundant number, since it is smaller than the sum of its proper divisors (95917349846934).

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

66607744770666 is a wasteful number, since it uses less digits than its factorization.

66607744770666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668492 (or 668489 counting only the distinct ones).

The product of its (nonzero) digits is 1792336896, while the sum is 72.

The spelling of 66607744770666 in words is "sixty-six trillion, six hundred seven billion, seven hundred forty-four million, seven hundred seventy thousand, six hundred sixty-six".