916921571680 has 96 divisors (see below), whose sum is σ = 2297849220576. Its totient is φ = 344562376704.

The previous prime is 916921571669. The next prime is 916921571771. The reversal of 916921571680 is 86175129619.

It is a happy number.

916921571680 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 2×916921571680² (a number of 25 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 15 ways as a sum of consecutive naturals, for example, 1179702 + ... + 1795978.

It is an arithmetic number, because the mean of its divisors is an integer number (23935929381).

Almost surely, 2^916921571680 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 916921571680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1148924610288).

916921571680 is an abundant number, since it is smaller than the sum of its proper divisors (1380927648896).

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

916921571680 is a wasteful number, since it uses less digits than its factorization.

916921571680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616856 (or 616848 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 916921571680 in words is "nine hundred sixteen billion, nine hundred twenty-one million, five hundred seventy-one thousand, six hundred eighty".