66120115 has 16 divisors (see below), whose sum is σ = 81230688. Its totient is φ = 51653376.

The previous prime is 66120107. The next prime is 66120127. The reversal of 66120115 is 51102166.

It is a cyclic number.

It is not a de Polignac number, because 66120115 - 2³ = 66120107 is a prime.

It is a super-2 number, since 2×66120115² = 8743739215226450, which contains 22 as substring.

It is a Duffinian 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, 38209 + ... + 39901.

It is an arithmetic number, because the mean of its divisors is an integer number (5076918).

Almost surely, 2^66120115 is an apocalyptic number.

66120115 is a deficient number, since it is larger than the sum of its proper divisors (15110573).

66120115 is a wasteful number, since it uses less digits than its factorization.

66120115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 66120115 is about 8131.4276114345. The cubic root of 66120115 is about 404.3690118453.

The spelling of 66120115 in words is "sixty-six million, one hundred twenty thousand, one hundred fifteen".