921678785160 has 256 divisors, whose sum is σ = 3194776166400. Its totient is φ = 208359032832.

The previous prime is 921678785119. The next prime is 921678785197. The reversal of 921678785160 is 61587876129.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 921678785094 and 921678785103.

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 63 ways as a sum of consecutive naturals, for example, 72583932 + ... + 72596628.

It is an arithmetic number, because the mean of its divisors is an integer number (12479594400).

Almost surely, 2^921678785160 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921678785160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1597388083200).

921678785160 is an abundant number, since it is smaller than the sum of its proper divisors (2273097381240).

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

921678785160 is a wasteful number, since it uses less digits than its factorization.

921678785160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13660 (or 13656 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 60.

The spelling of 921678785160 in words is "nine hundred twenty-one billion, six hundred seventy-eight million, seven hundred eighty-five thousand, one hundred sixty".