66253015 has 8 divisors (see below), whose sum is σ = 80807328. Its totient is φ = 52133280.

The previous prime is 66253013. The next prime is 66253027. The reversal of 66253015 is 51035266.

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

It is not a de Polignac number, because 66253015 - 2¹ = 66253013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66253013) by changing a digit.

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, 108307 + ... + 108916.

It is an arithmetic number, because the mean of its divisors is an integer number (10100916).

Almost surely, 2^66253015 is an apocalyptic number.

66253015 is a deficient number, since it is larger than the sum of its proper divisors (14554313).

66253015 is a wasteful number, since it uses less digits than its factorization.

66253015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217289.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66253015 is about 8139.5955059204. The cubic root of 66253015 is about 404.6397548508.

The spelling of 66253015 in words is "sixty-six million, two hundred fifty-three thousand, fifteen".