66666151616 has 28 divisors (see below), whose sum is σ = 132444759240. Its totient is φ = 33294243840.

The previous prime is 66666151609. The next prime is 66666151639. The reversal of 66666151616 is 61615166666.

It is a happy number.

It is a super-2 number, since 2×66666151616² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551345 + ... + 661296.

Almost surely, 2^66666151616 is an apocalyptic number.

It is an amenable number.

66666151616 is a deficient number, since it is larger than the sum of its proper divisors (65778607624).

66666151616 is a wasteful number, since it uses less digits than its factorization.

66666151616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213512 (or 1213502 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 50.

The spelling of 66666151616 in words is "sixty-six billion, six hundred sixty-six million, one hundred fifty-one thousand, six hundred sixteen".