91123067754561 has 16 divisors (see below), whose sum is σ = 121526131059968. Its totient is φ = 60734359872000.

The previous prime is 91123067754557. The next prime is 91123067754581. The reversal of 91123067754561 is 16545776032119.

It is not a de Polignac number, because 91123067754561 - 2² = 91123067754557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91123067754581) 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 15 ways as a sum of consecutive naturals, for example, 219259761 + ... + 219674961.

It is an arithmetic number, because the mean of its divisors is an integer number (7595383191248).

Almost surely, 2^{91123067754561} is an apocalyptic number.

It is an amenable number.

91123067754561 is a deficient number, since it is larger than the sum of its proper divisors (30403063305407).

91123067754561 is a wasteful number, since it uses less digits than its factorization.

91123067754561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432312.

The product of its (nonzero) digits is 9525600, while the sum is 57.

The spelling of 91123067754561 in words is "ninety-one trillion, one hundred twenty-three billion, sixty-seven million, seven hundred fifty-four thousand, five hundred sixty-one".