193987811512 has 32 divisors (see below), whose sum is σ = 420134033520. Its totient is φ = 82989437440.

The previous prime is 193987811503. The next prime is 193987811543. The reversal of 193987811512 is 215118789391.

It is a super-2 number, since 2×193987811512² (a number of 23 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 7 ways as a sum of consecutive naturals, for example, 64834003 + ... + 64836994.

Almost surely, 2^193987811512 is an apocalyptic number.

It is an amenable number.

193987811512 is an abundant number, since it is smaller than the sum of its proper divisors (226146222008).

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

193987811512 is a wasteful number, since it uses less digits than its factorization.

193987811512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129671031 (or 129671027 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 55.

The spelling of 193987811512 in words is "one hundred ninety-three billion, nine hundred eighty-seven million, eight hundred eleven thousand, five hundred twelve".