18253934949 has 4 divisors (see below), whose sum is σ = 24338579936. Its totient is φ = 12169289964.

The previous prime is 18253934921. The next prime is 18253934969. The reversal of 18253934949 is 94943935281.

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 not a de Polignac number, because 18253934949 - 2⁹ = 18253934437 is a prime.

It is a super-2 number, since 2×18253934949² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18253934969) 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, 3042322489 + ... + 3042322494.

It is an arithmetic number, because the mean of its divisors is an integer number (6084644984).

Almost surely, 2^18253934949 is an apocalyptic number.

It is an amenable number.

18253934949 is a deficient number, since it is larger than the sum of its proper divisors (6084644987).

18253934949 is an equidigital number, since it uses as much as digits as its factorization.

18253934949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6084644986.

The product of its digits is 8398080, while the sum is 57.

The spelling of 18253934949 in words is "eighteen billion, two hundred fifty-three million, nine hundred thirty-four thousand, nine hundred forty-nine".