1375638138257 has 4 divisors (see below), whose sum is σ = 1375664833536. Its totient is φ = 1375611442980.

The previous prime is 1375638138253. The next prime is 1375638138361. The reversal of 1375638138257 is 7528318365731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1375638138257 - 2² = 1375638138253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1375638138196 and 1375638138205.

It is not an unprimeable number, because it can be changed into a prime (1375638138253) 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, 13270193 + ... + 13373454.

It is an arithmetic number, because the mean of its divisors is an integer number (343916208384).

Almost surely, 2^{1375638138257} is an apocalyptic number.

It is an amenable number.

1375638138257 is a deficient number, since it is larger than the sum of its proper divisors (26695279).

1375638138257 is an equidigital number, since it uses as much as digits as its factorization.

1375638138257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26695278.

The product of its digits is 25401600, while the sum is 59.

The spelling of 1375638138257 in words is "one trillion, three hundred seventy-five billion, six hundred thirty-eight million, one hundred thirty-eight thousand, two hundred fifty-seven".