668081415 has 16 divisors (see below), whose sum is σ = 1069257600. Its totient is φ = 356200992.

The previous prime is 668081413. The next prime is 668081431. The reversal of 668081415 is 514180866.

668081415 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668081415 - 2¹ = 668081413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668081413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77176 + ... + 85394.

It is an arithmetic number, because the mean of its divisors is an integer number (66828600).

Almost surely, 2^668081415 is an apocalyptic number.

668081415 is a deficient number, since it is larger than the sum of its proper divisors (401176185).

668081415 is a wasteful number, since it uses less digits than its factorization.

668081415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13646.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 668081415 is about 25847.2709391146. The cubic root of 668081415 is about 874.1979763835.

The spelling of 668081415 in words is "six hundred sixty-eight million, eighty-one thousand, four hundred fifteen".