660420015 has 32 divisors (see below), whose sum is σ = 1101703680. Its totient is φ = 337524096.

The previous prime is 660420011. The next prime is 660420049. The reversal of 660420015 is 510024066.

It is not a de Polignac number, because 660420015 - 2² = 660420011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660420011) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 24526 + ... + 43844.

It is an arithmetic number, because the mean of its divisors is an integer number (34428240).

Almost surely, 2^660420015 is an apocalyptic number.

660420015 is a deficient number, since it is larger than the sum of its proper divisors (441283665).

660420015 is a wasteful number, since it uses less digits than its factorization.

660420015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19423.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 660420015 is about 25698.6383880547. The cubic root of 660420015 is about 870.8434217421.

The spelling of 660420015 in words is "six hundred sixty million, four hundred twenty thousand, fifteen".