1379256381685 has 48 divisors (see below), whose sum is σ = 2103606585216. Its totient is φ = 849428446464.

The previous prime is 1379256381683. The next prime is 1379256381689. The reversal of 1379256381685 is 5861836529731.

It is a happy number.

It is not a de Polignac number, because 1379256381685 - 2¹ = 1379256381683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379256381683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2932219 + ... + 3369928.

It is an arithmetic number, because the mean of its divisors is an integer number (43825137192).

Almost surely, 2^{1379256381685} is an apocalyptic number.

It is an amenable number.

1379256381685 is a deficient number, since it is larger than the sum of its proper divisors (724350203531).

1379256381685 is a wasteful number, since it uses less digits than its factorization.

1379256381685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6302222 (or 6302209 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 64.

The spelling of 1379256381685 in words is "one trillion, three hundred seventy-nine billion, two hundred fifty-six million, three hundred eighty-one thousand, six hundred eighty-five".