91081895049408 has 56 divisors (see below), whose sum is σ = 240999626120688. Its totient is φ = 30359105744896.

The previous prime is 91081895049407. The next prime is 91081895049479. The reversal of 91081895049408 is 80494059818019.

It is a super-3 number, since 3×91081895049408³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (91081895049403) 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, 8088141 + ... + 15734732.

Almost surely, 2^{91081895049408} is an apocalyptic number.

It is an amenable number.

91081895049408 is an abundant number, since it is smaller than the sum of its proper divisors (149917731071280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91081895049408 is a wasteful number, since it uses less digits than its factorization.

91081895049408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23842801 (or 23842791 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 66.

The spelling of 91081895049408 in words is "ninety-one trillion, eighty-one billion, eight hundred ninety-five million, forty-nine thousand, four hundred eight".