16621822814677 has 2 divisors, whose sum is σ = 16621822814678. Its totient is φ = 16621822814676.

The previous prime is 16621822814647. The next prime is 16621822814711. The reversal of 16621822814677 is 77641822812661.

It is a happy number.

16621822814677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10228009911876 + 6393812902801 = 3198126^2 + 2528599^2 .

It is a cyclic number.

It is not a de Polignac number, because 16621822814677 - 2⁴³ = 7825729792469 is a prime.

It is a super-2 number, since 2×16621822814677² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16621822814647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310911407338 + 8310911407339.

It is an arithmetic number, because the mean of its divisors is an integer number (8310911407339).

Almost surely, 2^{16621822814677} is an apocalyptic number.

It is an amenable number.

16621822814677 is a deficient number, since it is larger than the sum of its proper divisors (1).

16621822814677 is an equidigital number, since it uses as much as digits as its factorization.

16621822814677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21676032, while the sum is 61.

The spelling of 16621822814677 in words is "sixteen trillion, six hundred twenty-one billion, eight hundred twenty-two million, eight hundred fourteen thousand, six hundred seventy-seven".