7668043857 has 12 divisors (see below), whose sum is σ = 11257638964. Its totient is φ = 5028225120.

The previous prime is 7668043849. The next prime is 7668043861. The reversal of 7668043857 is 7583408667.

It can be written as a sum of positive squares in 2 ways, for example, as 217592001 + 7450451856 = 14751^2 + 86316^2 .

It is not a de Polignac number, because 7668043857 - 2³ = 7668043849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7668043847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6983098 + ... + 6984195.

Almost surely, 2^7668043857 is an apocalyptic number.

It is an amenable number.

7668043857 is a deficient number, since it is larger than the sum of its proper divisors (3589595107).

7668043857 is a wasteful number, since it uses less digits than its factorization.

7668043857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13967360 (or 13967357 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The square root of 7668043857 is about 87567.3675349442. The cubic root of 7668043857 is about 1971.9452949213.

It can be divided in two parts, 766804 and 3857, that added together give a triangular number (770661 = T₁₂₄₁).

The spelling of 7668043857 in words is "seven billion, six hundred sixty-eight million, forty-three thousand, eight hundred fifty-seven".