91890011016 has 48 divisors (see below), whose sum is σ = 251152001100. Its totient is φ = 30348991872.

The previous prime is 91890010991. The next prime is 91890011053. The reversal of 91890011016 is 61011009819.

It can be written as a sum of positive squares in 2 ways, for example, as 72870842916 + 19019168100 = 269946^2 + 137910^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5846511 + ... + 5862206.

Almost surely, 2^91890011016 is an apocalyptic number.

It is an amenable number.

91890011016 is an abundant number, since it is smaller than the sum of its proper divisors (159261990084).

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

91890011016 is a wasteful number, since it uses less digits than its factorization.

91890011016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11708838 (or 11708831 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 36.

The spelling of 91890011016 in words is "ninety-one billion, eight hundred ninety million, eleven thousand, sixteen".