16801371449 has 2 divisors, whose sum is σ = 16801371450. Its totient is φ = 16801371448.

The previous prime is 16801371443. The next prime is 16801371463. The reversal of 16801371449 is 94417310861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9978611449 + 6822760000 = 99893^2 + 82600^2 .

It is a cyclic number.

It is not a de Polignac number, because 16801371449 - 2⁸ = 16801371193 is a prime.

It is a super-3 number, since 3×16801371449³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16801371443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8400685724 + 8400685725.

It is an arithmetic number, because the mean of its divisors is an integer number (8400685725).

Almost surely, 2^16801371449 is an apocalyptic number.

It is an amenable number.

16801371449 is a deficient number, since it is larger than the sum of its proper divisors (1).

16801371449 is an equidigital number, since it uses as much as digits as its factorization.

16801371449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 16801371449 in words is "sixteen billion, eight hundred one million, three hundred seventy-one thousand, four hundred forty-nine".