18550066772 has 12 divisors (see below), whose sum is σ = 33339985140. Its totient is φ = 9024356736.

The previous prime is 18550066771. The next prime is 18550066811. The reversal of 18550066772 is 27766005581.

It can be written as a sum of positive squares in 2 ways, for example, as 7631070736 + 10918996036 = 87356^2 + 104494^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18550066771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62668997 + ... + 62669292.

It is an arithmetic number, because the mean of its divisors is an integer number (2778332095).

Almost surely, 2^18550066772 is an apocalyptic number.

It is an amenable number.

18550066772 is a deficient number, since it is larger than the sum of its proper divisors (14789918368).

18550066772 is a wasteful number, since it uses less digits than its factorization.

18550066772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125338330 (or 125338328 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 18550066772 in words is "eighteen billion, five hundred fifty million, sixty-six thousand, seven hundred seventy-two".