91603555680 has 768 divisors, whose sum is σ = 366324940800. Its totient is φ = 19118260224.

The previous prime is 91603555663. The next prime is 91603555709. The reversal of 91603555680 is 8655530619.

It is a happy number.

It is a super-2 number, since 2×91603555680² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 271820472 + ... + 271820808.

It is an arithmetic number, because the mean of its divisors is an integer number (476985600).

Almost surely, 2^91603555680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91603555680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183162470400).

91603555680 is an abundant number, since it is smaller than the sum of its proper divisors (274721385120).

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

91603555680 is a wasteful number, since it uses less digits than its factorization.

91603555680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 91603555680 in words is "ninety-one billion, six hundred three million, five hundred fifty-five thousand, six hundred eighty".