91662172160 has 480 divisors, whose sum is σ = 258023610432. Its totient is φ = 30953963520.

The previous prime is 91662172157. The next prime is 91662172171. The reversal of 91662172160 is 6127126619.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1104363479 + ... + 1104363561.

Almost surely, 2^91662172160 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 91662172160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129011805216).

91662172160 is an abundant number, since it is smaller than the sum of its proper divisors (166361438272).

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

91662172160 is a wasteful number, since it uses less digits than its factorization.

91662172160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

Adding to 91662172160 its reverse (6127126619), we get a palindrome (97789298779).

The spelling of 91662172160 in words is "ninety-one billion, six hundred sixty-two million, one hundred seventy-two thousand, one hundred sixty".