66515165115 has 64 divisors (see below), whose sum is σ = 124521255936. Its totient is φ = 29684293632.

The previous prime is 66515165089. The next prime is 66515165117. The reversal of 66515165115 is 51156151566.

It is not a de Polignac number, because 66515165115 - 2¹³ = 66515156923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66515165117) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16328719 + ... + 16332791.

It is an arithmetic number, because the mean of its divisors is an integer number (1945644624).

Almost surely, 2^66515165115 is an apocalyptic number.

66515165115 is a deficient number, since it is larger than the sum of its proper divisors (58006090821).

66515165115 is a wasteful number, since it uses less digits than its factorization.

66515165115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7748.

The product of its digits is 135000, while the sum is 42.

The spelling of 66515165115 in words is "sixty-six billion, five hundred fifteen million, one hundred sixty-five thousand, one hundred fifteen".