1665642104042 has 16 divisors (see below), whose sum is σ = 2855403124992. Its totient is φ = 713842450800.

The previous prime is 1665642104039. The next prime is 1665642104057. The reversal of 1665642104042 is 2404012465661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4123292 + ... + 4509192.

It is an arithmetic number, because the mean of its divisors is an integer number (178462695312).

Almost surely, 2^{1665642104042} is an apocalyptic number.

1665642104042 is a deficient number, since it is larger than the sum of its proper divisors (1189761020950).

1665642104042 is a wasteful number, since it uses less digits than its factorization.

1665642104042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694213.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 1665642104042 in words is "one trillion, six hundred sixty-five billion, six hundred forty-two million, one hundred four thousand, forty-two".