16221779177603 has 2 divisors, whose sum is σ = 16221779177604. Its totient is φ = 16221779177602.

The previous prime is 16221779177579. The next prime is 16221779177629. The reversal of 16221779177603 is 30677197712261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16221779177603 - 2¹⁰ = 16221779176579 is a prime.

It is a super-2 number, since 2×16221779177603² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16221779177203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110889588801 + 8110889588802.

It is an arithmetic number, because the mean of its divisors is an integer number (8110889588802).

Almost surely, 2^{16221779177603} is an apocalyptic number.

16221779177603 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221779177603 is an equidigital number, since it uses as much as digits as its factorization.

16221779177603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9335088, while the sum is 59.

The spelling of 16221779177603 in words is "sixteen trillion, two hundred twenty-one billion, seven hundred seventy-nine million, one hundred seventy-seven thousand, six hundred three".