91690619616 has 144 divisors (see below), whose sum is σ = 276316382160. Its totient is φ = 28789770240.

The previous prime is 91690619509. The next prime is 91690619681. The reversal of 91690619616 is 61691609619.

91690619616 is a `hidden beast` number, since 9 + 1 + 6 + 9 + 0 + 6 + 19 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208551 + ... + 476313.

It is an arithmetic number, because the mean of its divisors is an integer number (1918863765).

Almost surely, 2^91690619616 is an apocalyptic number.

91690619616 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91690619616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138158191080).

91690619616 is an abundant number, since it is smaller than the sum of its proper divisors (184625762544).

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

91690619616 is a wasteful number, since it uses less digits than its factorization.

91690619616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267849 (or 267838 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The spelling of 91690619616 in words is "ninety-one billion, six hundred ninety million, six hundred nineteen thousand, six hundred sixteen".