16620624241 has 27 divisors (see below), whose sum is σ = 18476115723. Its totient is φ = 14944522320.

The previous prime is 16620624221. The next prime is 16620624269. The reversal of 16620624241 is 14242602661.

The square root of 16620624241 is 128921.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2458672225 + 14161952016 = 49585^2 + 119004^2 .

It is not a de Polignac number, because 16620624241 - 2¹⁹ = 16620099953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16620624197 and 16620624206.

It is not an unprimeable number, because it can be changed into a prime (16620624221) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 78770626 + ... + 78770836.

Almost surely, 2^16620624241 is an apocalyptic number.

16620624241 is the 128921-st square number.

16620624241 is the 64461-st centered octagonal number.

It is an amenable number.

16620624241 is a deficient number, since it is larger than the sum of its proper divisors (1855491482).

16620624241 is an frugal number, since it uses more digits than its factorization.

16620624241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 16620624241 in words is "sixteen billion, six hundred twenty million, six hundred twenty-four thousand, two hundred forty-one".