66245015 has 4 divisors (see below), whose sum is σ = 79494024. Its totient is φ = 52996008.

The previous prime is 66245009. The next prime is 66245021. The reversal of 66245015 is 51054266.

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

It is an interprime number because it is at equal distance from previous prime (66245009) and next prime (66245021).

It is a cyclic number.

It is not a de Polignac number, because 66245015 - 2⁴ = 66244999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6624497 + ... + 6624506.

It is an arithmetic number, because the mean of its divisors is an integer number (19873506).

Almost surely, 2^66245015 is an apocalyptic number.

66245015 is a deficient number, since it is larger than the sum of its proper divisors (13249009).

66245015 is a wasteful number, since it uses less digits than its factorization.

66245015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13249008.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 66245015 is about 8139.1040661734. The cubic root of 66245015 is about 404.6234675501.

The spelling of 66245015 in words is "sixty-six million, two hundred forty-five thousand, fifteen".