1378612715409 has 6 divisors (see below), whose sum is σ = 1991329477826. Its totient is φ = 919075143600.

The previous prime is 1378612715407. The next prime is 1378612715461. The reversal of 1378612715409 is 9045172168731.

1378612715409 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 612 + 7 + 15 + 4 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1198361521809 + 180251193600 = 1094697^2 + 424560^2 .

It is not a de Polignac number, because 1378612715409 - 2¹ = 1378612715407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378612715401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76589595292 + ... + 76589595309.

It is a 1-persistent number, because it is pandigital, but 2⋅1378612715409 = 2757225430818 is not.

Almost surely, 2^{1378612715409} is an apocalyptic number.

It is an amenable number.

1378612715409 is a deficient number, since it is larger than the sum of its proper divisors (612716762417).

1378612715409 is a wasteful number, since it uses less digits than its factorization.

1378612715409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153179190607 (or 153179190604 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 1378612715409 in words is "one trillion, three hundred seventy-eight billion, six hundred twelve million, seven hundred fifteen thousand, four hundred nine".