18255290505 has 16 divisors (see below), whose sum is σ = 29212519104. Its totient is φ = 9734803520.

The previous prime is 18255290503. The next prime is 18255290507. The reversal of 18255290505 is 50509255281.

It is an interprime number because it is at equal distance from previous prime (18255290503) and next prime (18255290507).

It is not a de Polignac number, because 18255290505 - 2¹ = 18255290503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18255290503) 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, 32422 + ... + 193808.

It is an arithmetic number, because the mean of its divisors is an integer number (1825782444).

Almost surely, 2^18255290505 is an apocalyptic number.

18255290505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18255290505 is a deficient number, since it is larger than the sum of its proper divisors (10957228599).

18255290505 is a wasteful number, since it uses less digits than its factorization.

18255290505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168936.

The product of its (nonzero) digits is 180000, while the sum is 42.

The spelling of 18255290505 in words is "eighteen billion, two hundred fifty-five million, two hundred ninety thousand, five hundred five".