918458643509 has 4 divisors (see below), whose sum is σ = 1001954883840. Its totient is φ = 834962403180.

The previous prime is 918458643481. The next prime is 918458643539. The reversal of 918458643509 is 905346854819.

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 a de Polignac number, because none of the positive numbers 2^k-918458643509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918458643539) 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, 41748120149 + ... + 41748120170.

It is an arithmetic number, because the mean of its divisors is an integer number (250488720960).

Almost surely, 2^918458643509 is an apocalyptic number.

It is an amenable number.

918458643509 is a deficient number, since it is larger than the sum of its proper divisors (83496240331).

918458643509 is a wasteful number, since it uses less digits than its factorization.

918458643509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83496240330.

The product of its (nonzero) digits is 37324800, while the sum is 62.

The spelling of 918458643509 in words is "nine hundred eighteen billion, four hundred fifty-eight million, six hundred forty-three thousand, five hundred nine".