66706015 has 8 divisors (see below), whose sum is σ = 80122608. Its totient is φ = 53314560.

The previous prime is 66705983. The next prime is 66706033. The reversal of 66706015 is 51060766.

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

It is not a de Polignac number, because 66706015 - 2⁵ = 66705983 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159 + ... + 11551.

It is an arithmetic number, because the mean of its divisors is an integer number (10015326).

Almost surely, 2^66706015 is an apocalyptic number.

66706015 is a deficient number, since it is larger than the sum of its proper divisors (13416593).

66706015 is a wasteful number, since it uses less digits than its factorization.

66706015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12569.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 66706015 is about 8167.3750373054. The cubic root of 66706015 is about 405.5598921855.

The spelling of 66706015 in words is "sixty-six million, seven hundred six thousand, fifteen".