660264215 has 16 divisors (see below), whose sum is σ = 857612448. Its totient is φ = 485095296.

The previous prime is 660264203. The next prime is 660264251. The reversal of 660264215 is 512462066.

It is a cyclic number.

It is not a de Polignac number, because 660264215 - 2¹⁸ = 660002071 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, 12977 + ... + 38586.

It is an arithmetic number, because the mean of its divisors is an integer number (53600778).

Almost surely, 2^660264215 is an apocalyptic number.

660264215 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

660264215 is a deficient number, since it is larger than the sum of its proper divisors (197348233).

660264215 is a wasteful number, since it uses less digits than its factorization.

660264215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51778.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 660264215 is about 25695.6069202500. The cubic root of 660264215 is about 870.7749359943.

The spelling of 660264215 in words is "six hundred sixty million, two hundred sixty-four thousand, two hundred fifteen".