13703665981 has 2 divisors, whose sum is σ = 13703665982. Its totient is φ = 13703665980.

The previous prime is 13703665973. The next prime is 13703665999. The reversal of 13703665981 is 18956630731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10579973881 + 3123692100 = 102859^2 + 55890^2 .

It is a cyclic number.

It is not a de Polignac number, because 13703665981 - 2³ = 13703665973 is a prime.

It is a super-2 number, since 2×13703665981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13703665931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6851832990 + 6851832991.

It is an arithmetic number, because the mean of its divisors is an integer number (6851832991).

Almost surely, 2^13703665981 is an apocalyptic number.

It is an amenable number.

13703665981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13703665981 is an equidigital number, since it uses as much as digits as its factorization.

13703665981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 13703665981 in words is "thirteen billion, seven hundred three million, six hundred sixty-five thousand, nine hundred eighty-one".