609668881920 has 1680 divisors, whose sum is σ = 2615640199920. Its totient is φ = 135778664448.

The previous prime is 609668881883. The next prime is 609668881951. The reversal of 609668881920 is 29188866906.

609668881920 is a `hidden beast` number, since 609 + 6 + 6 + 8 + 8 + 8 + 19 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1680).

It is a super-2 number, since 2×609668881920² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 5395299784 + ... + 5395299896.

Almost surely, 2^609668881920 is an apocalyptic number.

609668881920 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 609668881920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1307820099960).

609668881920 is an abundant number, since it is smaller than the sum of its proper divisors (2005971318000).

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

609668881920 is an equidigital number, since it uses as much as digits as its factorization.

609668881920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 63.

The spelling of 609668881920 in words is "six hundred nine billion, six hundred sixty-eight million, eight hundred eighty-one thousand, nine hundred twenty".