16445492640 has 384 divisors, whose sum is σ = 61961034240. Its totient is φ = 4058726400.

The previous prime is 16445492621. The next prime is 16445492663. The reversal of 16445492640 is 4629454461.

16445492640 is a `hidden beast` number, since 1 + 6 + 44 + 549 + 2 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4478005 + ... + 4481675.

It is an arithmetic number, because the mean of its divisors is an integer number (161356860).

Almost surely, 2^16445492640 is an apocalyptic number.

16445492640 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 16445492640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30980517120).

16445492640 is an abundant number, since it is smaller than the sum of its proper divisors (45515541600).

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

16445492640 is a wasteful number, since it uses less digits than its factorization.

16445492640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3773 (or 3759 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 16445492640 in words is "sixteen billion, four hundred forty-five million, four hundred ninety-two thousand, six hundred forty".