66111111506015 has 16 divisors (see below), whose sum is σ = 81031562542080. Its totient is φ = 51757022422560.

The previous prime is 66111111505997. The next prime is 66111111506047. The reversal of 66111111506015 is 51060511111166.

It is a de Polignac number, because none of the positive numbers 2^k-66111111506015 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16001201 + ... + 19704330.

It is an arithmetic number, because the mean of its divisors is an integer number (5064472658880).

Almost surely, 2^{66111111506015} is an apocalyptic number.

66111111506015 is a deficient number, since it is larger than the sum of its proper divisors (14920451036065).

66111111506015 is a wasteful number, since it uses less digits than its factorization.

66111111506015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35713462.

The product of its (nonzero) digits is 5400, while the sum is 35.

The spelling of 66111111506015 in words is "sixty-six trillion, one hundred eleven billion, one hundred eleven million, five hundred six thousand, fifteen".