18191513064 has 32 divisors (see below), whose sum is σ = 47872404000. Its totient is φ = 5744688192.

The previous prime is 18191513029. The next prime is 18191513113. The reversal of 18191513064 is 46031519181.

It is a super-2 number, since 2×18191513064² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19946379 + ... + 19947290.

It is an arithmetic number, because the mean of its divisors is an integer number (1496012625).

Almost surely, 2^18191513064 is an apocalyptic number.

It is an amenable number.

18191513064 is an abundant number, since it is smaller than the sum of its proper divisors (29680890936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18191513064 is a wasteful number, since it uses less digits than its factorization.

18191513064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39893697 (or 39893693 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The spelling of 18191513064 in words is "eighteen billion, one hundred ninety-one million, five hundred thirteen thousand, sixty-four".