993158181421 has 16 divisors (see below), whose sum is σ = 1183252589568. Its totient is φ = 815661216000.

The previous prime is 993158181419. The next prime is 993158181497. The reversal of 993158181421 is 124181851399.

It is a cyclic number.

It is not a de Polignac number, because 993158181421 - 2¹ = 993158181419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993158185421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22635340 + ... + 22679173.

It is an arithmetic number, because the mean of its divisors is an integer number (73953286848).

Almost surely, 2^993158181421 is an apocalyptic number.

It is an amenable number.

993158181421 is a deficient number, since it is larger than the sum of its proper divisors (190094408147).

993158181421 is a wasteful number, since it uses less digits than its factorization.

993158181421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45314652.

The product of its digits is 622080, while the sum is 52.

The spelling of 993158181421 in words is "nine hundred ninety-three billion, one hundred fifty-eight million, one hundred eighty-one thousand, four hundred twenty-one".