66065660156499 has 16 divisors (see below), whose sum is σ = 91102941287424. Its totient is φ = 42541509376800.

The previous prime is 66065660156477. The next prime is 66065660156527. The reversal of 66065660156499 is 99465106656066.

It is not a de Polignac number, because 66065660156499 - 2⁹ = 66065660155987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66065660156099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679094232 + ... + 679191509.

It is an arithmetic number, because the mean of its divisors is an integer number (5693933830464).

Almost surely, 2^{66065660156499} is an apocalyptic number.

66065660156499 is a deficient number, since it is larger than the sum of its proper divisors (25037281130925).

66065660156499 is a wasteful number, since it uses less digits than its factorization.

66065660156499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358286298.

The product of its (nonzero) digits is 377913600, while the sum is 69.

The spelling of 66065660156499 in words is "sixty-six trillion, sixty-five billion, six hundred sixty million, one hundred fifty-six thousand, four hundred ninety-nine".