91685093506 has 4 divisors (see below), whose sum is σ = 137527640262. Its totient is φ = 45842546752.

The previous prime is 91685093501. The next prime is 91685093557. The reversal of 91685093506 is 60539058619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51012287881 + 40672805625 = 225859^2 + 201675^2 .

It is not an unprimeable number, because it can be changed into a prime (91685093501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22921273375 + ... + 22921273378.

Almost surely, 2^91685093506 is an apocalyptic number.

91685093506 is a deficient number, since it is larger than the sum of its proper divisors (45842546756).

91685093506 is a wasteful number, since it uses less digits than its factorization.

91685093506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45842546755.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The spelling of 91685093506 in words is "ninety-one billion, six hundred eighty-five million, ninety-three thousand, five hundred six".