16425394640 has 80 divisors (see below), whose sum is σ = 39490329600. Its totient is φ = 6347028480.

The previous prime is 16425394637. The next prime is 16425394669. The reversal of 16425394640 is 4649352461.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 16425394591 and 16425394600.

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, 1479992 + ... + 1491048.

It is an arithmetic number, because the mean of its divisors is an integer number (493629120).

Almost surely, 2^16425394640 is an apocalyptic number.

16425394640 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 16425394640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19745164800).

16425394640 is an abundant number, since it is smaller than the sum of its proper divisors (23064934960).

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

16425394640 is a wasteful number, since it uses less digits than its factorization.

16425394640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11700 (or 11694 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 16425394640 in words is "sixteen billion, four hundred twenty-five million, three hundred ninety-four thousand, six hundred forty".