18780725205 has 72 divisors (see below), whose sum is σ = 37107217056. Its totient is φ = 9105734880.

The previous prime is 18780725203. The next prime is 18780725219. The reversal of 18780725205 is 50252708781.

It is not a de Polignac number, because 18780725205 - 2¹ = 18780725203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18780725203) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 83142 + ... + 210888.

Almost surely, 2^18780725205 is an apocalyptic number.

18780725205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18780725205 is a deficient number, since it is larger than the sum of its proper divisors (18326491851).

18780725205 is a wasteful number, since it uses less digits than its factorization.

18780725205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127789 (or 127766 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 45.

The spelling of 18780725205 in words is "eighteen billion, seven hundred eighty million, seven hundred twenty-five thousand, two hundred five".