18777005244 has 36 divisors (see below), whose sum is σ = 47884143216. Its totient is φ = 6203611008.

The previous prime is 18777005239. The next prime is 18777005287. The reversal of 18777005244 is 44250077781.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18777005244.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2303824 + ... + 2311959.

Almost surely, 2^18777005244 is an apocalyptic number.

It is an amenable number.

18777005244 is an abundant number, since it is smaller than the sum of its proper divisors (29107137972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18777005244 is a wasteful number, since it uses less digits than its factorization.

18777005244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615906 (or 4615901 counting only the distinct ones).

The product of its (nonzero) digits is 439040, while the sum is 45.

The spelling of 18777005244 in words is "eighteen billion, seven hundred seventy-seven million, five thousand, two hundred forty-four".