121609018658 has 32 divisors (see below), whose sum is σ = 190958233536. Its totient is φ = 58020625728.

The previous prime is 121609018633. The next prime is 121609018669. The reversal of 121609018658 is 856810906121.

It is a happy 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, 12400385 + ... + 12410187.

It is an arithmetic number, because the mean of its divisors is an integer number (5967444798).

Almost surely, 2^121609018658 is an apocalyptic number.

121609018658 is a deficient number, since it is larger than the sum of its proper divisors (69349214878).

121609018658 is a wasteful number, since it uses less digits than its factorization.

121609018658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13058.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 121609018658 in words is "one hundred twenty-one billion, six hundred nine million, eighteen thousand, six hundred fifty-eight".