66001015 has 8 divisors (see below), whose sum is σ = 81756288. Its totient is φ = 51097440.

The previous prime is 66000997. The next prime is 66001027. The reversal of 66001015 is 51010066.

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

It is not a de Polignac number, because 66001015 - 2¹⁹ = 65476727 is a prime.

It is a super-2 number, since 2×66001015² = 8712267962060450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66000983 and 66001001.

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, 212752 + ... + 213061.

It is an arithmetic number, because the mean of its divisors is an integer number (10219536).

Almost surely, 2^66001015 is an apocalyptic number.

66001015 is a deficient number, since it is larger than the sum of its proper divisors (15755273).

66001015 is a wasteful number, since it uses less digits than its factorization.

66001015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425849.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 66001015 is about 8124.1008733275. The cubic root of 66001015 is about 404.1260736974.

The spelling of 66001015 in words is "sixty-six million, one thousand, fifteen".