188387446489 has 16 divisors (see below), whose sum is σ = 214479498240. Its totient is φ = 163791836560.

The previous prime is 188387446477. The next prime is 188387446523. The reversal of 188387446489 is 984644783881.

It is not a de Polignac number, because 188387446489 - 2¹³ = 188387438297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188387446439) 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, 1863174 + ... + 1961680.

It is an arithmetic number, because the mean of its divisors is an integer number (13404968640).

Almost surely, 2^188387446489 is an apocalyptic number.

It is an amenable number.

188387446489 is a deficient number, since it is larger than the sum of its proper divisors (26092051751).

188387446489 is a wasteful number, since it uses less digits than its factorization.

188387446489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106100.

The product of its digits is 297271296, while the sum is 70.

The spelling of 188387446489 in words is "one hundred eighty-eight billion, three hundred eighty-seven million, four hundred forty-six thousand, four hundred eighty-nine".