16691852515601 has 2 divisors, whose sum is σ = 16691852515602. Its totient is φ = 16691852515600.

The previous prime is 16691852515589. The next prime is 16691852515603. The reversal of 16691852515601 is 10651525819661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14267058534976 + 2424793980625 = 3777176^2 + 1557175^2 .

It is a cyclic number.

It is not a de Polignac number, because 16691852515601 - 2²² = 16691848321297 is a prime.

Together with 16691852515603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16691852515603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8345926257800 + 8345926257801.

It is an arithmetic number, because the mean of its divisors is an integer number (8345926257801).

Almost surely, 2^{16691852515601} is an apocalyptic number.

It is an amenable number.

16691852515601 is a deficient number, since it is larger than the sum of its proper divisors (1).

16691852515601 is an equidigital number, since it uses as much as digits as its factorization.

16691852515601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888000, while the sum is 56.

The spelling of 16691852515601 in words is "sixteen trillion, six hundred ninety-one billion, eight hundred fifty-two million, five hundred fifteen thousand, six hundred one".