66189648111890 has 16 divisors (see below), whose sum is σ = 121389316915608. Its totient is φ = 25976314730496.

The previous prime is 66189648111827. The next prime is 66189648111901. The reversal of 66189648111890 is 9811184698166.

It can be written as a sum of positive squares in 4 ways, for example, as 64960102007089 + 1229546104801 = 8059783^2 + 1108849^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66189648111890.

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, 62443063727 + ... + 62443064786.

Almost surely, 2^{66189648111890} is an apocalyptic number.

66189648111890 is a deficient number, since it is larger than the sum of its proper divisors (55199668803718).

66189648111890 is a wasteful number, since it uses less digits than its factorization.

66189648111890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124886128573.

The product of its (nonzero) digits is 35831808, while the sum is 68.

The spelling of 66189648111890 in words is "sixty-six trillion, one hundred eighty-nine billion, six hundred forty-eight million, one hundred eleven thousand, eight hundred ninety".