7668978853 has 4 divisors (see below), whose sum is σ = 7673370400. Its totient is φ = 7664587308.

The previous prime is 7668978847. The next prime is 7668978859. The reversal of 7668978853 is 3588798667.

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 an interprime number because it is at equal distance from previous prime (7668978847) and next prime (7668978859).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7668978853 is a prime.

It is a super-2 number, since 2×7668978853² (a number of 21 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 (7668978859) 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, 2193153 + ... + 2196646.

It is an arithmetic number, because the mean of its divisors is an integer number (1918342600).

Almost surely, 2^7668978853 is an apocalyptic number.

It is an amenable number.

7668978853 is a deficient number, since it is larger than the sum of its proper divisors (4391547).

7668978853 is a wasteful number, since it uses less digits than its factorization.

7668978853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391546.

The product of its digits is 121927680, while the sum is 67.

The square root of 7668978853 is about 87572.7060961348. The cubic root of 7668978853 is about 1972.0254407865.

The spelling of 7668978853 in words is "seven billion, six hundred sixty-eight million, nine hundred seventy-eight thousand, eight hundred fifty-three".