91824645505 has 8 divisors (see below), whose sum is σ = 110282883624. Its totient is φ = 73397510400.

The previous prime is 91824645481. The next prime is 91824645547. The reversal of 91824645505 is 50554642819.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17247043584 + 74577601921 = 131328^2 + 273089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91824645505 - 2⁹ = 91824644993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7769256 + ... + 7781065.

It is an arithmetic number, because the mean of its divisors is an integer number (13785360453).

Almost surely, 2^91824645505 is an apocalyptic number.

It is an amenable number.

91824645505 is a deficient number, since it is larger than the sum of its proper divisors (18458238119).

91824645505 is a wasteful number, since it uses less digits than its factorization.

91824645505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15551507.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 91824645505 in words is "ninety-one billion, eight hundred twenty-four million, six hundred forty-five thousand, five hundred five".