7878525451891 has 8 divisors (see below), whose sum is σ = 8067509542400. Its totient is φ = 7689803296392.

The previous prime is 7878525451879. The next prime is 7878525451903. The reversal of 7878525451891 is 1981545258787.

It is an interprime number because it is at equal distance from previous prime (7878525451879) and next prime (7878525451903).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7878525451891 - 2⁵ = 7878525451859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7878525451891.

It is not an unprimeable number, because it can be changed into a prime (7878525451861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65422875 + ... + 65543188.

It is an arithmetic number, because the mean of its divisors is an integer number (1008438692800).

Almost surely, 2^{7878525451891} is an apocalyptic number.

7878525451891 is a deficient number, since it is larger than the sum of its proper divisors (188984090509).

7878525451891 is a wasteful number, since it uses less digits than its factorization.

7878525451891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130967505.

The product of its digits is 225792000, while the sum is 70.

The spelling of 7878525451891 in words is "seven trillion, eight hundred seventy-eight billion, five hundred twenty-five million, four hundred fifty-one thousand, eight hundred ninety-one".