18782409285 has 24 divisors (see below), whose sum is σ = 34471246680. Its totient is φ = 9428032512.

The previous prime is 18782409241. The next prime is 18782409287. The reversal of 18782409285 is 58290428781.

18782409285 is a `hidden beast` number, since 1 + 87 + 82 + 409 + 2 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10782537921 + 7999871364 = 103839^2 + 89442^2 .

It is not a de Polignac number, because 18782409285 - 2⁷ = 18782409157 is a prime.

It is a super-2 number, since 2×18782409285² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18782409287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12275320 + ... + 12276849.

It is an arithmetic number, because the mean of its divisors is an integer number (1436301945).

Almost surely, 2^18782409285 is an apocalyptic number.

18782409285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18782409285 is a deficient number, since it is larger than the sum of its proper divisors (15688837395).

18782409285 is a wasteful number, since it uses less digits than its factorization.

18782409285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24552197 (or 24552194 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 18782409285 in words is "eighteen billion, seven hundred eighty-two million, four hundred nine thousand, two hundred eighty-five".