66665150515 has 32 divisors (see below), whose sum is σ = 85080637440. Its totient is φ = 50042006784.

The previous prime is 66665150483. The next prime is 66665150579. The reversal of 66665150515 is 51505156666.

It is a cyclic number.

It is not a de Polignac number, because 66665150515 - 2⁵ = 66665150483 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 1274202 + ... + 1325488.

It is an arithmetic number, because the mean of its divisors is an integer number (2658769920).

Almost surely, 2^66665150515 is an apocalyptic number.

66665150515 is a deficient number, since it is larger than the sum of its proper divisors (18415486925).

66665150515 is a wasteful number, since it uses less digits than its factorization.

66665150515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51531.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 66665150515 in words is "sixty-six billion, six hundred sixty-five million, one hundred fifty thousand, five hundred fifteen".