875649068249 has 4 divisors (see below), whose sum is σ = 892170748836. Its totient is φ = 859127387664.

The previous prime is 875649068213. The next prime is 875649068251. The reversal of 875649068249 is 942860946578.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 942860946578 = 2 ⋅471430473289.

It can be written as a sum of positive squares in 2 ways, for example, as 225477774025 + 650171294224 = 474845^2 + 806332^2 .

It is a cyclic number.

It is not a de Polignac number, because 875649068249 - 2²⁴ = 875632291033 is a prime.

It is a super-2 number, since 2×875649068249² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (875649068279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8260840214 + ... + 8260840319.

It is an arithmetic number, because the mean of its divisors is an integer number (223042687209).

Almost surely, 2^875649068249 is an apocalyptic number.

It is an amenable number.

875649068249 is a deficient number, since it is larger than the sum of its proper divisors (16521680587).

875649068249 is a wasteful number, since it uses less digits than its factorization.

875649068249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16521680586.

The product of its (nonzero) digits is 209018880, while the sum is 68.

The spelling of 875649068249 in words is "eight hundred seventy-five billion, six hundred forty-nine million, sixty-eight thousand, two hundred forty-nine".