91641540266 has 16 divisors (see below), whose sum is σ = 139152198024. Its totient is φ = 45260242944.

The previous prime is 91641540257. The next prime is 91641540293. The reversal of 91641540266 is 66204514619.

It can be written as a sum of positive squares in 4 ways, for example, as 91100745241 + 540795025 = 301829^2 + 23255^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625751 + ... + 758186.

Almost surely, 2^91641540266 is an apocalyptic number.

91641540266 is a deficient number, since it is larger than the sum of its proper divisors (47510657758).

91641540266 is a wasteful number, since it uses less digits than its factorization.

91641540266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384345.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 91641540266 in words is "ninety-one billion, six hundred forty-one million, five hundred forty thousand, two hundred sixty-six".