18215240153 has 4 divisors (see below), whose sum is σ = 19871171088. Its totient is φ = 16559309220.

The previous prime is 18215240129. The next prime is 18215240161. The reversal of 18215240153 is 35104251281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18215240153 - 2⁶ = 18215240089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18215240453) 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, 827965451 + ... + 827965472.

It is an arithmetic number, because the mean of its divisors is an integer number (4967792772).

Almost surely, 2^18215240153 is an apocalyptic number.

It is an amenable number.

18215240153 is a deficient number, since it is larger than the sum of its proper divisors (1655930935).

18215240153 is a wasteful number, since it uses less digits than its factorization.

18215240153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655930934.

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 18215240153 in words is "eighteen billion, two hundred fifteen million, two hundred forty thousand, one hundred fifty-three".