16309121840 has 160 divisors (see below), whose sum is σ = 42630753600. Its totient is φ = 5751848960.

The previous prime is 16309121837. The next prime is 16309121863. The reversal of 16309121840 is 4812190361.

It is a self number, because there is not a number n which added to its sum of digits gives 16309121840.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4148996 + ... + 4152924.

It is an arithmetic number, because the mean of its divisors is an integer number (266442210).

Almost surely, 2^16309121840 is an apocalyptic number.

16309121840 is a gapful number since it is divisible by the number (10) 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 16309121840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21315376800).

16309121840 is an abundant number, since it is smaller than the sum of its proper divisors (26321631760).

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

16309121840 is a wasteful number, since it uses less digits than its factorization.

16309121840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095 (or 4089 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 16309121840 in words is "sixteen billion, three hundred nine million, one hundred twenty-one thousand, eight hundred forty".