166645553105 has 16 divisors (see below), whose sum is σ = 202368747600. Its totient is φ = 131722567680.

The previous prime is 166645553101. The next prime is 166645553111. The reversal of 166645553105 is 501355546661.

It can be written as a sum of positive squares in 8 ways, for example, as 423001489 + 166222551616 = 20567^2 + 407704^2 .

It is not a de Polignac number, because 166645553105 - 2² = 166645553101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166645553105.

It is not an unprimeable number, because it can be changed into a prime (166645553101) 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, 478961 + ... + 750129.

It is an arithmetic number, because the mean of its divisors is an integer number (12648046725).

Almost surely, 2^166645553105 is an apocalyptic number.

It is an amenable number.

166645553105 is a deficient number, since it is larger than the sum of its proper divisors (35723194495).

166645553105 is a wasteful number, since it uses less digits than its factorization.

166645553105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272644.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 166645553105 in words is "one hundred sixty-six billion, six hundred forty-five million, five hundred fifty-three thousand, one hundred five".