16502253457 has 2 divisors, whose sum is σ = 16502253458. Its totient is φ = 16502253456.

The previous prime is 16502253419. The next prime is 16502253461. The reversal of 16502253457 is 75435220561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16199180176 + 303073281 = 127276^2 + 17409^2 .

It is an emirp because it is prime and its reverse (75435220561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16502253457 - 2¹⁹ = 16501729169 is a prime.

It is not a weakly prime, because it can be changed into another prime (16502253557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8251126728 + 8251126729.

It is an arithmetic number, because the mean of its divisors is an integer number (8251126729).

Almost surely, 2^16502253457 is an apocalyptic number.

It is an amenable number.

16502253457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16502253457 is an equidigital number, since it uses as much as digits as its factorization.

16502253457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 16502253457 in words is "sixteen billion, five hundred two million, two hundred fifty-three thousand, four hundred fifty-seven".