16221463461557 has 2 divisors, whose sum is σ = 16221463461558. Its totient is φ = 16221463461556.

The previous prime is 16221463461503. The next prime is 16221463461607. The reversal of 16221463461557 is 75516436412261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10863576448036 + 5357887013521 = 3295994^2 + 2314711^2 .

It is a cyclic number.

It is not a de Polignac number, because 16221463461557 - 2³⁶ = 16152743984821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16221463461499 and 16221463461508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16221463461157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110731730778 + 8110731730779.

It is an arithmetic number, because the mean of its divisors is an integer number (8110731730779).

Almost surely, 2^{16221463461557} is an apocalyptic number.

It is an amenable number.

16221463461557 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221463461557 is an equidigital number, since it uses as much as digits as its factorization.

16221463461557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 53.

The spelling of 16221463461557 in words is "sixteen trillion, two hundred twenty-one billion, four hundred sixty-three million, four hundred sixty-one thousand, five hundred fifty-seven".