66115105 has 32 divisors (see below), whose sum is σ = 93415680. Its totient is φ = 43987200.

The previous prime is 66115097. The next prime is 66115109. The reversal of 66115105 is 50151166.

66115105 = T₂₃₈ + T₂₃₉ + ... + T₇₄₂.

66115105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66115105 - 2³ = 66115097 is a prime.

It is a super-2 number, since 2×66115105² = 8742414218322050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66115105.

It is not an unprimeable number, because it can be changed into a prime (66115109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208407 + ... + 208723.

It is an arithmetic number, because the mean of its divisors is an integer number (2919240).

Almost surely, 2^66115105 is an apocalyptic number.

It is an amenable number.

66115105 is a deficient number, since it is larger than the sum of its proper divisors (27300575).

66115105 is a wasteful number, since it uses less digits than its factorization.

66115105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 66115105 is about 8131.1195416130. The cubic root of 66115105 is about 404.3587984132.

The spelling of 66115105 in words is "sixty-six million, one hundred fifteen thousand, one hundred five".