1378125342857 has 4 divisors (see below), whose sum is σ = 1378351234116. Its totient is φ = 1377899451600.

The previous prime is 1378125342823. The next prime is 1378125342859. The reversal of 1378125342857 is 7582435218731.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1047052841536 + 331072501321 = 1023256^2 + 575389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378125342857 - 2¹⁸ = 1378125080713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378125342859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112936478 + ... + 112948679.

It is an arithmetic number, because the mean of its divisors is an integer number (344587808529).

Almost surely, 2^{1378125342857} is an apocalyptic number.

It is an amenable number.

1378125342857 is a deficient number, since it is larger than the sum of its proper divisors (225891259).

1378125342857 is an equidigital number, since it uses as much as digits as its factorization.

1378125342857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225891258.

The product of its digits is 11289600, while the sum is 56.

The spelling of 1378125342857 in words is "one trillion, three hundred seventy-eight billion, one hundred twenty-five million, three hundred forty-two thousand, eight hundred fifty-seven".