91788286655 has 16 divisors (see below), whose sum is σ = 118803815424. Its totient is φ = 67676344320.

The previous prime is 91788286619. The next prime is 91788286669. The reversal of 91788286655 is 55668288719.

It is not a de Polignac number, because 91788286655 - 2⁶ = 91788286591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91788286591 and 91788286600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1059839 + ... + 1143168.

It is an arithmetic number, because the mean of its divisors is an integer number (7425238464).

Almost surely, 2^91788286655 is an apocalyptic number.

91788286655 is a deficient number, since it is larger than the sum of its proper divisors (27015528769).

91788286655 is a wasteful number, since it uses less digits than its factorization.

91788286655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203666.

The product of its digits is 58060800, while the sum is 65.

The spelling of 91788286655 in words is "ninety-one billion, seven hundred eighty-eight million, two hundred eighty-six thousand, six hundred fifty-five".