91867878568612 has 24 divisors (see below), whose sum is σ = 162109177957440. Its totient is φ = 45552007034400.

The previous prime is 91867878568493. The next prime is 91867878568639. The reversal of 91867878568612 is 21686587876819.

It is a super-2 number, since 2×91867878568612² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129201787 + ... + 129910882.

It is an arithmetic number, because the mean of its divisors is an integer number (6754549081560).

Almost surely, 2^{91867878568612} is an apocalyptic number.

It is an amenable number.

91867878568612 is a deficient number, since it is larger than the sum of its proper divisors (70241299388828).

91867878568612 is a wasteful number, since it uses less digits than its factorization.

91867878568612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259113411 (or 259113409 counting only the distinct ones).

The product of its digits is 3901685760, while the sum is 82.

The spelling of 91867878568612 in words is "ninety-one trillion, eight hundred sixty-seven billion, eight hundred seventy-eight million, five hundred sixty-eight thousand, six hundred twelve".