91660354633 has 4 divisors (see below), whose sum is σ = 92209219200. Its totient is φ = 91111490068.

The previous prime is 91660354613. The next prime is 91660354637. The reversal of 91660354633 is 33645306619.

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, and also an emirpimes, since its reverse is a distinct semiprime: 33645306619 = 8219 ⋅4093601.

It is a cyclic number.

It is not a de Polignac number, because 91660354633 - 2¹⁷ = 91660223561 is a prime.

It is a super-2 number, since 2×91660354633² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91660354637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274432033 + ... + 274432366.

It is an arithmetic number, because the mean of its divisors is an integer number (23052304800).

Almost surely, 2^91660354633 is an apocalyptic number.

It is an amenable number.

91660354633 is a deficient number, since it is larger than the sum of its proper divisors (548864567).

91660354633 is a wasteful number, since it uses less digits than its factorization.

91660354633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548864566.

The product of its (nonzero) digits is 1049760, while the sum is 46.

The spelling of 91660354633 in words is "ninety-one billion, six hundred sixty million, three hundred fifty-four thousand, six hundred thirty-three".