91761205536000 has 6912 divisors, whose sum is σ = 483665159577600. Its totient is φ = 16809762816000.

The previous prime is 91761205535957. The next prime is 91761205536001. The reversal of 91761205536000 is 63550216719.

91761205536000 is a `hidden beast` number, since 9 + 1 + 76 + 1 + 20 + 553 + 6 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (6912).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91761205536001) by changing a digit.

It is a polite number, since it can be written in 767 ways as a sum of consecutive naturals, for example, 139243103671 + ... + 139243104329.

It is an arithmetic number, because the mean of its divisors is an integer number (69974704800).

Almost surely, 2^{91761205536000} is an apocalyptic number.

91761205536000 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 91761205536000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241832579788800).

91761205536000 is an abundant number, since it is smaller than the sum of its proper divisors (391903954041600).

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

91761205536000 is a wasteful number, since it uses less digits than its factorization.

91761205536000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The spelling of 91761205536000 in words is "ninety-one trillion, seven hundred sixty-one billion, two hundred five million, five hundred thirty-six thousand".