13470256781 has 2 divisors, whose sum is σ = 13470256782. Its totient is φ = 13470256780.

The previous prime is 13470256769. The next prime is 13470256847. The reversal of 13470256781 is 18765207431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13330780681 + 139476100 = 115459^2 + 11810^2 .

It is a cyclic number.

It is not a de Polignac number, because 13470256781 - 2¹⁴ = 13470240397 is a prime.

It is a super-2 number, since 2×13470256781² (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 (13470255781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6735128390 + 6735128391.

It is an arithmetic number, because the mean of its divisors is an integer number (6735128391).

Almost surely, 2^13470256781 is an apocalyptic number.

It is an amenable number.

13470256781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13470256781 is an equidigital number, since it uses as much as digits as its factorization.

13470256781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 13470256781 in words is "thirteen billion, four hundred seventy million, two hundred fifty-six thousand, seven hundred eighty-one".