6866742545 has 16 divisors (see below), whose sum is σ = 8880257232. Its totient is φ = 5067217920.

The previous prime is 6866742521. The next prime is 6866742577. The reversal of 6866742545 is 5452476686.

It can be written as a sum of positive squares in 8 ways, for example, as 322417936 + 6544324609 = 17956^2 + 80897^2 .

It is not a de Polignac number, because 6866742545 - 2¹⁴ = 6866726161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56285 + ... + 130005.

It is an arithmetic number, because the mean of its divisors is an integer number (555016077).

Almost surely, 2^6866742545 is an apocalyptic number.

6866742545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6866742545 is a deficient number, since it is larger than the sum of its proper divisors (2013514687).

6866742545 is a wasteful number, since it uses less digits than its factorization.

6866742545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75172.

The product of its digits is 9676800, while the sum is 53.

The square root of 6866742545 is about 82865.8104709053. The cubic root of 6866742545 is about 1900.7146476015.

The spelling of 6866742545 in words is "six billion, eight hundred sixty-six million, seven hundred forty-two thousand, five hundred forty-five".