91858022085819 has 32 divisors (see below), whose sum is σ = 133833653247744. Its totient is φ = 55579040369280.

The previous prime is 91858022085803. The next prime is 91858022085827.

It is a happy number.

91858022085819 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 91858022085819 - 2⁴ = 91858022085803 is a prime.

It is a super-2 number, since 2×91858022085819² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91858022085819.

It is not an unprimeable number, because it can be changed into a prime (91858022085019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1164887997 + ... + 1164966849.

It is an arithmetic number, because the mean of its divisors is an integer number (4182301663992).

Almost surely, 2^{91858022085819} is an apocalyptic number.

91858022085819 is a deficient number, since it is larger than the sum of its proper divisors (41975631161925).

91858022085819 is a wasteful number, since it uses less digits than its factorization.

91858022085819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137067.

The product of its (nonzero) digits is 33177600, while the sum is 66.

The spelling of 91858022085819 in words is "ninety-one trillion, eight hundred fifty-eight billion, twenty-two million, eighty-five thousand, eight hundred nineteen".