91782991755 has 448 divisors, whose sum is σ = 221001032448. Its totient is φ = 35473489920.

The previous prime is 91782991723. The next prime is 91782991759. The reversal of 91782991755 is 55719928719.

91782991755 is a `hidden beast` number, since 9 + 178 + 299 + 175 + 5 = 666.

It is not a de Polignac number, because 91782991755 - 2⁵ = 91782991723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 91782991692 and 91782991701.

It is not an unprimeable number, because it can be changed into a prime (91782991759) by changing a digit.

It is a polite number, since it can be written in 447 ways as a sum of consecutive naturals, for example, 231191217 + ... + 231191613.

It is an arithmetic number, because the mean of its divisors is an integer number (493305876).

Almost surely, 2^91782991755 is an apocalyptic number.

91782991755 is an abundant number, since it is smaller than the sum of its proper divisors (129218040693).

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

91782991755 is a wasteful number, since it uses less digits than its factorization.

91782991755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 483 counting only the distinct ones).

The product of its digits is 14288400, while the sum is 63.

The spelling of 91782991755 in words is "ninety-one billion, seven hundred eighty-two million, nine hundred ninety-one thousand, seven hundred fifty-five".