16066614640 has 80 divisors (see below), whose sum is σ = 37831328640. Its totient is φ = 6344898560.

The previous prime is 16066614593. The next prime is 16066614661. The reversal of 16066614640 is 4641666061.

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

It is a super-2 number, since 2×16066614640² (a number of 21 digits) contains 22 as substring.

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 = 16066614593 and 16066614602.

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, 6485082 + ... + 6487558.

It is an arithmetic number, because the mean of its divisors is an integer number (472891608).

Almost surely, 2^16066614640 is an apocalyptic number.

16066614640 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 16066614640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18915664320).

16066614640 is an abundant number, since it is smaller than the sum of its proper divisors (21764714000).

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

16066614640 is a wasteful number, since it uses less digits than its factorization.

16066614640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490 (or 3484 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 16066614640 in words is "sixteen billion, sixty-six million, six hundred fourteen thousand, six hundred forty".