66142515 has 16 divisors (see below), whose sum is σ = 111398400. Its totient is φ = 33419232.

The previous prime is 66142511. The next prime is 66142523. The reversal of 66142515 is 51524166.

66142515 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 66142515 - 2² = 66142511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66142511) 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 15 ways as a sum of consecutive naturals, for example, 115755 + ... + 116324.

It is an arithmetic number, because the mean of its divisors is an integer number (6962400).

Almost surely, 2^66142515 is an apocalyptic number.

66142515 is a deficient number, since it is larger than the sum of its proper divisors (45255885).

66142515 is a wasteful number, since it uses less digits than its factorization.

66142515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232106.

The product of its digits is 7200, while the sum is 30.

The square root of 66142515 is about 8132.8048667111. The cubic root of 66142515 is about 404.4146703825.

The spelling of 66142515 in words is "sixty-six million, one hundred forty-two thousand, five hundred fifteen".