609188785920 has 864 divisors, whose sum is σ = 2606674936320. Its totient is φ = 129140490240.

The previous prime is 609188785861. The next prime is 609188785987. The reversal of 609188785920 is 29587881906.

It is a happy number.

609188785920 is a `hidden beast` number, since 609 + 18 + 8 + 7 + 8 + 5 + 9 + 2 + 0 = 666.

609188785920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×609188785920² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31290109 + ... + 31309571.

It is an arithmetic number, because the mean of its divisors is an integer number (3016984880).

Almost surely, 2^609188785920 is an apocalyptic number.

609188785920 is a gapful number since it is divisible by the number (60) 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 609188785920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1303337468160).

609188785920 is an abundant number, since it is smaller than the sum of its proper divisors (1997486150400).

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

609188785920 is a wasteful number, since it uses less digits than its factorization.

609188785920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19533 (or 19516 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 609188785920 in words is "six hundred nine billion, one hundred eighty-eight million, seven hundred eighty-five thousand, nine hundred twenty".