91278450433 has 8 divisors (see below), whose sum is σ = 94365483776. Its totient is φ = 88200327600.

The previous prime is 91278450407. The next prime is 91278450451. The reversal of 91278450433 is 33405487219.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91278450433 - 2³³ = 82688515841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91278430433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2206791 + ... + 2247772.

It is an arithmetic number, because the mean of its divisors is an integer number (11795685472).

Almost surely, 2^91278450433 is an apocalyptic number.

It is an amenable number.

91278450433 is a deficient number, since it is larger than the sum of its proper divisors (3087033343).

91278450433 is a wasteful number, since it uses less digits than its factorization.

91278450433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455255.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 91278450433 in words is "ninety-one billion, two hundred seventy-eight million, four hundred fifty thousand, four hundred thirty-three".