66661550115 has 16 divisors (see below), whose sum is σ = 107083420416. Its totient is φ = 35411180000.

The previous prime is 66661550099. The next prime is 66661550159. The reversal of 66661550115 is 51105516666.

It is not a de Polignac number, because 66661550115 - 2⁴ = 66661550099 is a prime.

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, 8849031 + ... + 8856560.

It is an arithmetic number, because the mean of its divisors is an integer number (6692713776).

Almost surely, 2^66661550115 is an apocalyptic number.

66661550115 is a deficient number, since it is larger than the sum of its proper divisors (40421870301).

66661550115 is a wasteful number, since it uses less digits than its factorization.

66661550115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17705850.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 66661550115 in words is "sixty-six billion, six hundred sixty-one million, five hundred fifty thousand, one hundred fifteen".