7957887628391 has 4 divisors (see below), whose sum is σ = 7958008842672. Its totient is φ = 7957766414112.

The previous prime is 7957887628387. The next prime is 7957887628423. The reversal of 7957887628391 is 1938267887597.

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

It is a cyclic number.

It is not a de Polignac number, because 7957887628391 - 2² = 7957887628387 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 (7957887628291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60508610 + ... + 60639983.

It is an arithmetic number, because the mean of its divisors is an integer number (1989502210668).

Almost surely, 2^{7957887628391} is an apocalyptic number.

7957887628391 is a deficient number, since it is larger than the sum of its proper divisors (121214281).

7957887628391 is a wasteful number, since it uses less digits than its factorization.

7957887628391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121214280.

The product of its digits is 2560481280, while the sum is 80.

The spelling of 7957887628391 in words is "seven trillion, nine hundred fifty-seven billion, eight hundred eighty-seven million, six hundred twenty-eight thousand, three hundred ninety-one".