18197121534 has 32 divisors (see below), whose sum is σ = 36499268736. Its totient is φ = 6048230880.

The previous prime is 18197121529. The next prime is 18197121559. The reversal of 18197121534 is 43512179181.

It is a super-2 number, since 2×18197121534² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3301609 + ... + 3307115.

It is an arithmetic number, because the mean of its divisors is an integer number (1140602148).

Almost surely, 2^18197121534 is an apocalyptic number.

18197121534 is an abundant number, since it is smaller than the sum of its proper divisors (18302147202).

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

18197121534 is a wasteful number, since it uses less digits than its factorization.

18197121534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000.

The product of its digits is 60480, while the sum is 42.

The spelling of 18197121534 in words is "eighteen billion, one hundred ninety-seven million, one hundred twenty-one thousand, five hundred thirty-four".