66499015 has 8 divisors (see below), whose sum is σ = 87053328. Its totient is φ = 48362880.

The previous prime is 66498979. The next prime is 66499039. The reversal of 66499015 is 51099466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66499015 - 2¹⁷ = 66367943 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 7 ways as a sum of consecutive naturals, for example, 604482 + ... + 604591.

It is an arithmetic number, because the mean of its divisors is an integer number (10881666).

Almost surely, 2^66499015 is an apocalyptic number.

66499015 is a deficient number, since it is larger than the sum of its proper divisors (20554313).

66499015 is a wasteful number, since it uses less digits than its factorization.

66499015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209089.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 66499015 is about 8154.6928207015. The cubic root of 66499015 is about 405.1399506174.

The spelling of 66499015 in words is "sixty-six million, four hundred ninety-nine thousand, fifteen".