91863728205 has 16 divisors (see below), whose sum is σ = 150954451584. Its totient is φ = 47669826240.

The previous prime is 91863728191. The next prime is 91863728221. The reversal of 91863728205 is 50282736819.

It is not a de Polignac number, because 91863728205 - 2¹⁰ = 91863727181 is a prime.

It is a super-2 number, since 2×91863728205² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

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, 82759561 + ... + 82760670.

It is an arithmetic number, because the mean of its divisors is an integer number (9434653224).

Almost surely, 2^91863728205 is an apocalyptic number.

It is an amenable number.

91863728205 is a deficient number, since it is larger than the sum of its proper divisors (59090723379).

91863728205 is a wasteful number, since it uses less digits than its factorization.

91863728205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165520276.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 91863728205 in words is "ninety-one billion, eight hundred sixty-three million, seven hundred twenty-eight thousand, two hundred five".