187959797568 has 140 divisors (see below), whose sum is σ = 559144891360. Its totient is φ = 62431388928.

The previous prime is 187959797561. The next prime is 187959797581. The reversal of 187959797568 is 865797959781.

187959797568 is a `hidden beast` number, since 18 + 7 + 9 + 597 + 9 + 7 + 5 + 6 + 8 = 666.

It is a super-3 number, since 3×187959797568³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187959797561) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1403013 + ... + 1531131.

Almost surely, 2^187959797568 is an apocalyptic number.

187959797568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 187959797568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279572445680).

187959797568 is an abundant number, since it is smaller than the sum of its proper divisors (371185093792).

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

187959797568 is a wasteful number, since it uses less digits than its factorization.

187959797568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128426 (or 128407 counting only the distinct ones).

The product of its digits is 2400451200, while the sum is 81.

The spelling of 187959797568 in words is "one hundred eighty-seven billion, nine hundred fifty-nine million, seven hundred ninety-seven thousand, five hundred sixty-eight".