66656666516 has 12 divisors (see below), whose sum is σ = 127253636160. Its totient is φ = 30298484760.

The previous prime is 66656666491. The next prime is 66656666521. The reversal of 66656666516 is 61566665666.

It is a super-2 number, since 2×66656666516² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757462076 + ... + 757462163.

It is an arithmetic number, because the mean of its divisors is an integer number (10604469680).

Almost surely, 2^66656666516 is an apocalyptic number.

It is an amenable number.

66656666516 is a deficient number, since it is larger than the sum of its proper divisors (60596969644).

66656666516 is a wasteful number, since it uses less digits than its factorization.

66656666516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514924254 (or 1514924252 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 59.

The spelling of 66656666516 in words is "sixty-six billion, six hundred fifty-six million, six hundred sixty-six thousand, five hundred sixteen".