91667542088 has 16 divisors (see below), whose sum is σ = 171888940860. Its totient is φ = 45830491200.

The previous prime is 91667542049. The next prime is 91667542093. The reversal of 91667542088 is 88024576619.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86540695684 + 5126846404 = 294178^2 + 71602^2 .

It is an unprimeable number.

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, 289103 + ... + 516638.

Almost surely, 2^91667542088 is an apocalyptic number.

It is an amenable number.

91667542088 is a deficient number, since it is larger than the sum of its proper divisors (80221398772).

91667542088 is a wasteful number, since it uses less digits than its factorization.

91667542088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819968 (or 819964 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 91667542088 in words is "ninety-one billion, six hundred sixty-seven million, five hundred forty-two thousand, eighty-eight".