13705210781 has 8 divisors (see below), whose sum is σ = 13753911360. Its totient is φ = 13656589632.

The previous prime is 13705210769. The next prime is 13705210787. The reversal of 13705210781 is 18701250731.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13705210781 - 2¹⁸ = 13704948637 is a prime.

It is a super-2 number, since 2×13705210781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13705210787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337130 + ... + 375588.

It is an arithmetic number, because the mean of its divisors is an integer number (1719238920).

Almost surely, 2^13705210781 is an apocalyptic number.

It is an amenable number.

13705210781 is a deficient number, since it is larger than the sum of its proper divisors (48700579).

13705210781 is an equidigital number, since it uses as much as digits as its factorization.

13705210781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39715.

The product of its (nonzero) digits is 11760, while the sum is 35.

The spelling of 13705210781 in words is "thirteen billion, seven hundred five million, two hundred ten thousand, seven hundred eighty-one".