16646742790520 has 128 divisors (see below), whose sum is σ = 38827129904640. Its totient is φ = 6416666449920.

The previous prime is 16646742790463. The next prime is 16646742790537. The reversal of 16646742790520 is 2509724764661.

It is a super-2 number, since 2×16646742790520² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16646742790520.

It is a congruent number.

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, 301998002 + ... + 302053118.

It is an arithmetic number, because the mean of its divisors is an integer number (303336952380).

Almost surely, 2^{16646742790520} is an apocalyptic number.

16646742790520 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 16646742790520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19413564952320).

16646742790520 is an abundant number, since it is smaller than the sum of its proper divisors (22180387114120).

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

16646742790520 is a wasteful number, since it uses less digits than its factorization.

16646742790520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56185 (or 56181 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 16646742790520 in words is "sixteen trillion, six hundred forty-six billion, seven hundred forty-two million, seven hundred ninety thousand, five hundred twenty".