66457015 has 4 divisors (see below), whose sum is σ = 79748424. Its totient is φ = 53165608.

The previous prime is 66456991. The next prime is 66457031. The reversal of 66457015 is 51075466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66457015 - 2¹⁷ = 66325943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6645697 + ... + 6645706.

It is an arithmetic number, because the mean of its divisors is an integer number (19937106).

Almost surely, 2^66457015 is an apocalyptic number.

66457015 is a deficient number, since it is larger than the sum of its proper divisors (13291409).

66457015 is a wasteful number, since it uses less digits than its factorization.

66457015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13291408.

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

The square root of 66457015 is about 8152.1172096579. The cubic root of 66457015 is about 405.0546387697.

The spelling of 66457015 in words is "sixty-six million, four hundred fifty-seven thousand, fifteen".