16621420038560 has 48 divisors (see below), whose sum is σ = 39270416693256. Its totient is φ = 6648176590848.

The previous prime is 16621420038541. The next prime is 16621420038581. The reversal of 16621420038560 is 6583002412661.

It can be written as a sum of positive squares in 4 ways, for example, as 9888785886736 + 6732634151824 = 3144644^2 + 2594732^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324209 + ... + 5774768.

Almost surely, 2^{16621420038560} is an apocalyptic number.

16621420038560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16621420038560 is an abundant number, since it is smaller than the sum of its proper divisors (22648996654696).

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

16621420038560 is a wasteful number, since it uses less digits than its factorization.

16621420038560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116025 (or 6116017 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 16621420038560 in words is "sixteen trillion, six hundred twenty-one billion, four hundred twenty million, thirty-eight thousand, five hundred sixty".