1659872172556 has 48 divisors (see below), whose sum is σ = 3136703169600. Its totient is φ = 764019313920.

The previous prime is 1659872172487. The next prime is 1659872172649. The reversal of 1659872172556 is 6552712789561.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

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, 46703665 + ... + 46739191.

It is an arithmetic number, because the mean of its divisors is an integer number (65347982700).

Almost surely, 2^{1659872172556} is an apocalyptic number.

It is an amenable number.

1659872172556 is a deficient number, since it is larger than the sum of its proper divisors (1476830997044).

1659872172556 is a wasteful number, since it uses less digits than its factorization.

1659872172556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37954 (or 37952 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 64.

The spelling of 1659872172556 in words is "one trillion, six hundred fifty-nine billion, eight hundred seventy-two million, one hundred seventy-two thousand, five hundred fifty-six".