91669236549 has 16 divisors (see below), whose sum is σ = 133894978560. Its totient is φ = 55324651760.

The previous prime is 91669236499. The next prime is 91669236569. The reversal of 91669236549 is 94563296619.

It is a cyclic number.

It is not a de Polignac number, because 91669236549 - 2⁹ = 91669236037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91669236492 and 91669236501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91669236569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5803527 + ... + 5819300.

It is an arithmetic number, because the mean of its divisors is an integer number (8368436160).

Almost surely, 2^91669236549 is an apocalyptic number.

It is an amenable number.

91669236549 is a deficient number, since it is larger than the sum of its proper divisors (42225742011).

91669236549 is a wasteful number, since it uses less digits than its factorization.

91669236549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11623080.

The product of its digits is 18895680, while the sum is 60.

The spelling of 91669236549 in words is "ninety-one billion, six hundred sixty-nine million, two hundred thirty-six thousand, five hundred forty-nine".