16575015221497 has 2 divisors, whose sum is σ = 16575015221498. Its totient is φ = 16575015221496.

The previous prime is 16575015221447. The next prime is 16575015221509. The reversal of 16575015221497 is 79412251057561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12812827409001 + 3762187812496 = 3579501^2 + 1939636^2 .

It is a cyclic number.

It is not a de Polignac number, because 16575015221497 - 2³⁹ = 16025259407609 is a prime.

It is a super-2 number, since 2×16575015221497² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16575015221407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8287507610748 + 8287507610749.

It is an arithmetic number, because the mean of its divisors is an integer number (8287507610749).

Almost surely, 2^{16575015221497} is an apocalyptic number.

It is an amenable number.

16575015221497 is a deficient number, since it is larger than the sum of its proper divisors (1).

16575015221497 is an equidigital number, since it uses as much as digits as its factorization.

16575015221497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292000, while the sum is 55.

The spelling of 16575015221497 in words is "sixteen trillion, five hundred seventy-five billion, fifteen million, two hundred twenty-one thousand, four hundred ninety-seven".