7878232556881 has 4 divisors (see below), whose sum is σ = 7954720251712. Its totient is φ = 7801744862052.

The previous prime is 7878232556827. The next prime is 7878232556911. The reversal of 7878232556881 is 1886552328787.

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 a de Polignac number, because none of the positive numbers 2^k-7878232556881 is a prime.

It is a super-2 number, since 2×7878232556881² (a number of 27 digits) contains 22 as substring.

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 7878232556881.

It is not an unprimeable number, because it can be changed into a prime (7878232556281) 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, 38243847261 + ... + 38243847466.

It is an arithmetic number, because the mean of its divisors is an integer number (1988680062928).

Almost surely, 2^{7878232556881} is an apocalyptic number.

It is an amenable number.

7878232556881 is a deficient number, since it is larger than the sum of its proper divisors (76487694831).

7878232556881 is a wasteful number, since it uses less digits than its factorization.

7878232556881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76487694830.

The product of its digits is 361267200, while the sum is 70.

The spelling of 7878232556881 in words is "seven trillion, eight hundred seventy-eight billion, two hundred thirty-two million, five hundred fifty-six thousand, eight hundred eighty-one".