16516425640 has 256 divisors, whose sum is σ = 46535731200. Its totient is φ = 5186073600.

The previous prime is 16516425589. The next prime is 16516425643. The reversal of 16516425640 is 4652461561.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 16516425593 and 16516425602.

It is not an unprimeable number, because it can be changed into a prime (16516425643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9019525 + ... + 9021355.

It is an arithmetic number, because the mean of its divisors is an integer number (181780200).

Almost surely, 2^16516425640 is an apocalyptic number.

16516425640 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 16516425640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23267865600).

16516425640 is an abundant number, since it is smaller than the sum of its proper divisors (30019305560).

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

16516425640 is a wasteful number, since it uses less digits than its factorization.

16516425640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 16516425640 in words is "sixteen billion, five hundred sixteen million, four hundred twenty-five thousand, six hundred forty".