13351606781 has 2 divisors, whose sum is σ = 13351606782. Its totient is φ = 13351606780.

The previous prime is 13351606703. The next prime is 13351606811. The reversal of 13351606781 is 18760615331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12958179556 + 393427225 = 113834^2 + 19835^2 .

It is a cyclic number.

It is not a de Polignac number, because 13351606781 - 2¹⁸ = 13351344637 is a prime.

It is a super-2 number, since 2×13351606781² (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 (13351606181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6675803390 + 6675803391.

It is an arithmetic number, because the mean of its divisors is an integer number (6675803391).

Almost surely, 2^13351606781 is an apocalyptic number.

It is an amenable number.

13351606781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13351606781 is an equidigital number, since it uses as much as digits as its factorization.

13351606781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 13351606781 in words is "thirteen billion, three hundred fifty-one million, six hundred six thousand, seven hundred eighty-one".