13993367081 has 2 divisors, whose sum is σ = 13993367082. Its totient is φ = 13993367080.

The previous prime is 13993367021. The next prime is 13993367093. The reversal of 13993367081 is 18076339931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11539056400 + 2454310681 = 107420^2 + 49541^2 .

It is a cyclic number.

It is not a de Polignac number, because 13993367081 - 2¹⁴ = 13993350697 is a prime.

It is a super-2 number, since 2×13993367081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13993367021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6996683540 + 6996683541.

It is an arithmetic number, because the mean of its divisors is an integer number (6996683541).

Almost surely, 2^13993367081 is an apocalyptic number.

It is an amenable number.

13993367081 is a deficient number, since it is larger than the sum of its proper divisors (1).

13993367081 is an equidigital number, since it uses as much as digits as its factorization.

13993367081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 13993367081 in words is "thirteen billion, nine hundred ninety-three million, three hundred sixty-seven thousand, eighty-one".