91408260661 has 4 divisors (see below), whose sum is σ = 92695701024. Its totient is φ = 90120820300.

The previous prime is 91408260659. The next prime is 91408260673. The reversal of 91408260661 is 16606280419.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91408260661 - 2¹ = 91408260659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91408260061) 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, 643720075 + ... + 643720216.

It is an arithmetic number, because the mean of its divisors is an integer number (23173925256).

Almost surely, 2^91408260661 is an apocalyptic number.

It is an amenable number.

91408260661 is a deficient number, since it is larger than the sum of its proper divisors (1287440363).

91408260661 is a wasteful number, since it uses less digits than its factorization.

91408260661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287440362.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 91408260661 in words is "ninety-one billion, four hundred eight million, two hundred sixty thousand, six hundred sixty-one".