16165680687493 has 2 divisors, whose sum is σ = 16165680687494. Its totient is φ = 16165680687492.

The previous prime is 16165680687433. The next prime is 16165680687503. The reversal of 16165680687493 is 39478608656161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15267008919204 + 898671768289 = 3907302^2 + 947983^2 .

It is a cyclic number.

It is not a de Polignac number, because 16165680687493 - 2²⁹ = 16165143816581 is a prime.

It is a super-2 number, since 2×16165680687493² (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 (16165680687433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8082840343746 + 8082840343747.

It is an arithmetic number, because the mean of its divisors is an integer number (8082840343747).

Almost surely, 2^{16165680687493} is an apocalyptic number.

It is an amenable number.

16165680687493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16165680687493 is an equidigital number, since it uses as much as digits as its factorization.

16165680687493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 313528320, while the sum is 70.

The spelling of 16165680687493 in words is "sixteen trillion, one hundred sixty-five billion, six hundred eighty million, six hundred eighty-seven thousand, four hundred ninety-three".