1357878391871 has 4 divisors (see below), whose sum is σ = 1358048283312. Its totient is φ = 1357708500432.

The previous prime is 1357878391841. The next prime is 1357878391931. The reversal of 1357878391871 is 1781938787531.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1357878391871 is a prime.

It is a super-2 number, since 2×1357878391871² (a number of 25 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 (1357878391841) 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, 84933731 + ... + 84949716.

It is an arithmetic number, because the mean of its divisors is an integer number (339512070828).

Almost surely, 2^{1357878391871} is an apocalyptic number.

1357878391871 is a deficient number, since it is larger than the sum of its proper divisors (169891441).

1357878391871 is an equidigital number, since it uses as much as digits as its factorization.

1357878391871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169891440.

The product of its digits is 71124480, while the sum is 68.

The spelling of 1357878391871 in words is "one trillion, three hundred fifty-seven billion, eight hundred seventy-eight million, three hundred ninety-one thousand, eight hundred seventy-one".