91416551533 has 4 divisors (see below), whose sum is σ = 93887269180. Its totient is φ = 88945833888.

The previous prime is 91416551497. The next prime is 91416551557. The reversal of 91416551533 is 33515561419.

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

It can be written as a sum of positive squares in 2 ways, for example, as 86705513764 + 4711037769 = 294458^2 + 68637^2 .

It is a cyclic number.

It is not a de Polignac number, because 91416551533 - 2³³ = 82826616941 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 91416551533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91416551833) 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, 1235358768 + ... + 1235358841.

It is an arithmetic number, because the mean of its divisors is an integer number (23471817295).

Almost surely, 2^91416551533 is an apocalyptic number.

It is an amenable number.

91416551533 is a deficient number, since it is larger than the sum of its proper divisors (2470717647).

91416551533 is a wasteful number, since it uses less digits than its factorization.

91416551533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470717646.

The product of its digits is 243000, while the sum is 43.

The spelling of 91416551533 in words is "ninety-one billion, four hundred sixteen million, five hundred fifty-one thousand, five hundred thirty-three".