7871181645 has 32 divisors (see below), whose sum is σ = 13372636032. Its totient is φ = 3939786752.

The previous prime is 7871181631. The next prime is 7871181671. The reversal of 7871181645 is 5461811787.

It is a cyclic number.

It is not a de Polignac number, because 7871181645 - 2⁴ = 7871181629 is a prime.

It is a super-3 number, since 3×7871181645³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7871181594 and 7871181603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46294 + ... + 133736.

It is an arithmetic number, because the mean of its divisors is an integer number (417894876).

Almost surely, 2^7871181645 is an apocalyptic number.

It is an amenable number.

7871181645 is a deficient number, since it is larger than the sum of its proper divisors (5501454387).

7871181645 is a wasteful number, since it uses less digits than its factorization.

7871181645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87821.

The product of its digits is 376320, while the sum is 48.

The square root of 7871181645 is about 88719.6801448247. The cubic root of 7871181645 is about 1989.2069974029.

The spelling of 7871181645 in words is "seven billion, eight hundred seventy-one million, one hundred eighty-one thousand, six hundred forty-five".