666015675465638 has 16 divisors (see below), whose sum is σ = 999456722550000. Its totient is φ = 332863460962272.

The previous prime is 666015675465611. The next prime is 666015675465653. The reversal of 666015675465638 is 836564576510666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44018888 + ... + 57181236.

It is an arithmetic number, because the mean of its divisors is an integer number (62466045159375).

Almost surely, 2^{666015675465638} is an apocalyptic number.

666015675465638 is a deficient number, since it is larger than the sum of its proper divisors (333441047084362).

666015675465638 is a wasteful number, since it uses less digits than its factorization.

666015675465638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13173319.

The product of its (nonzero) digits is 3919104000, while the sum is 74.

The spelling of 666015675465638 in words is "six hundred sixty-six trillion, fifteen billion, six hundred seventy-five million, four hundred sixty-five thousand, six hundred thirty-eight".