18216734957 has 4 divisors (see below), whose sum is σ = 18640380000. Its totient is φ = 17793089916.

The previous prime is 18216734953. The next prime is 18216735041. The reversal of 18216734957 is 75943761281.

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 18216734957 - 2² = 18216734953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18216734899 and 18216734908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18216734953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211822457 + ... + 211822542.

It is an arithmetic number, because the mean of its divisors is an integer number (4660095000).

Almost surely, 2^18216734957 is an apocalyptic number.

It is an amenable number.

18216734957 is a deficient number, since it is larger than the sum of its proper divisors (423645043).

18216734957 is an equidigital number, since it uses as much as digits as its factorization.

18216734957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423645042.

The product of its digits is 2540160, while the sum is 53.

The spelling of 18216734957 in words is "eighteen billion, two hundred sixteen million, seven hundred thirty-four thousand, nine hundred fifty-seven".