66740515 has 16 divisors (see below), whose sum is σ = 83511648. Its totient is φ = 51158016.

The previous prime is 66740437. The next prime is 66740519. The reversal of 66740515 is 51504766.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66740515 - 2¹¹ = 66738467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66740519) 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, 8467 + ... + 14323.

It is an arithmetic number, because the mean of its divisors is an integer number (5219478).

Almost surely, 2^66740515 is an apocalyptic number.

66740515 is a deficient number, since it is larger than the sum of its proper divisors (16771133).

66740515 is a wasteful number, since it uses less digits than its factorization.

66740515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 66740515 is about 8169.4868259885. The cubic root of 66740515 is about 405.6297979494.

The spelling of 66740515 in words is "sixty-six million, seven hundred forty thousand, five hundred fifteen".