91067665071 has 4 divisors (see below), whose sum is σ = 121423553432. Its totient is φ = 60711776712.

The previous prime is 91067665069. The next prime is 91067665099. The reversal of 91067665071 is 17056676019.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 91067665071 - 2¹ = 91067665069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91067665071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91067665021) 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, 15177944176 + ... + 15177944181.

It is an arithmetic number, because the mean of its divisors is an integer number (30355888358).

Almost surely, 2^91067665071 is an apocalyptic number.

91067665071 is a deficient number, since it is larger than the sum of its proper divisors (30355888361).

91067665071 is a wasteful number, since it uses less digits than its factorization.

91067665071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30355888360.

The product of its (nonzero) digits is 476280, while the sum is 48.

The spelling of 91067665071 in words is "ninety-one billion, sixty-seven million, six hundred sixty-five thousand, seventy-one".