66250015 has 16 divisors (see below), whose sum is σ = 85954176. Its totient is φ = 48729600.

The previous prime is 66249983. The next prime is 66250027. The reversal of 66250015 is 51005266.

It is not a de Polignac number, because 66250015 - 2⁵ = 66249983 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 15 ways as a sum of consecutive naturals, for example, 15735 + ... + 19495.

It is an arithmetic number, because the mean of its divisors is an integer number (5372136).

Almost surely, 2^66250015 is an apocalyptic number.

66250015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66250015 is a deficient number, since it is larger than the sum of its proper divisors (19704161).

66250015 is a wasteful number, since it uses less digits than its factorization.

66250015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 66250015 is about 8139.4112194925. The cubic root of 66250015 is about 404.6336472667.

The spelling of 66250015 in words is "sixty-six million, two hundred fifty thousand, fifteen".