91868001660 has 144 divisors (see below), whose sum is σ = 289389609600. Its totient is φ = 24464026944.

The previous prime is 91868001629. The next prime is 91868001671. The reversal of 91868001660 is 6610086819.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3578751 + ... + 3604329.

Almost surely, 2^91868001660 is an apocalyptic number.

91868001660 is a gapful number since it is divisible by the number (90) 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 91868001660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144694804800).

91868001660 is an abundant number, since it is smaller than the sum of its proper divisors (197521607940).

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

91868001660 is a wasteful number, since it uses less digits than its factorization.

91868001660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26342 (or 26328 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 91868001660 in words is "ninety-one billion, eight hundred sixty-eight million, one thousand, six hundred sixty".