91798419505 has 64 divisors (see below), whose sum is σ = 123025706496. Its totient is φ = 65318400000.

The previous prime is 91798419491. The next prime is 91798419511. The reversal of 91798419505 is 50591489719.

It is not a de Polignac number, because 91798419505 - 2²³ = 91790030897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91798419505.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 145480540 + ... + 145481170.

It is an arithmetic number, because the mean of its divisors is an integer number (1922276664).

Almost surely, 2^91798419505 is an apocalyptic number.

It is an amenable number.

91798419505 is a deficient number, since it is larger than the sum of its proper divisors (31227286991).

91798419505 is a wasteful number, since it uses less digits than its factorization.

91798419505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178.

The product of its (nonzero) digits is 4082400, while the sum is 58.

The spelling of 91798419505 in words is "ninety-one billion, seven hundred ninety-eight million, four hundred nineteen thousand, five hundred five".