66115510107 has 16 divisors (see below), whose sum is σ = 90243558912. Its totient is φ = 43036691040.

The previous prime is 66115510103. The next prime is 66115510163. The reversal of 66115510107 is 70101551166.

It is not a de Polignac number, because 66115510107 - 2² = 66115510103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66115510103) 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, 497533 + ... + 616254.

It is an arithmetic number, because the mean of its divisors is an integer number (5640222432).

Almost surely, 2^66115510107 is an apocalyptic number.

66115510107 is a deficient number, since it is larger than the sum of its proper divisors (24128048805).

66115510107 is a wasteful number, since it uses less digits than its factorization.

66115510107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114258.

The product of its (nonzero) digits is 6300, while the sum is 33.

The spelling of 66115510107 in words is "sixty-six billion, one hundred fifteen million, five hundred ten thousand, one hundred seven".