75866666857 has 8 divisors (see below), whose sum is σ = 77094000680. Its totient is φ = 74644416000.

The previous prime is 75866666849. The next prime is 75866666879.

75866666857 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 26784922921 + 49081743936 = 163661^2 + 221544^2 .

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 75866666857 - 2³ = 75866666849 is a prime.

It is a super-2 number, since 2×75866666857² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75866666657) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1240644 + ... + 1300357.

It is an arithmetic number, because the mean of its divisors is an integer number (9636750085).

Almost surely, 2^75866666857 is an apocalyptic number.

It is an amenable number.

75866666857 is a deficient number, since it is larger than the sum of its proper divisors (1227333823).

75866666857 is a wasteful number, since it uses less digits than its factorization.

75866666857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541483.

The product of its digits is 609638400, while the sum is 70.

The spelling of 75866666857 in words is "seventy-five billion, eight hundred sixty-six million, six hundred sixty-six thousand, eight hundred fifty-seven".