91890037666 has 16 divisors (see below), whose sum is σ = 157620315456. Its totient is φ = 39357810576.

The previous prime is 91890037643. The next prime is 91890037697. The reversal of 91890037666 is 66673009819.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1945341 + ... + 1992016.

It is an arithmetic number, because the mean of its divisors is an integer number (9851269716).

Almost surely, 2^91890037666 is an apocalyptic number.

91890037666 is a deficient number, since it is larger than the sum of its proper divisors (65730277790).

91890037666 is a wasteful number, since it uses less digits than its factorization.

91890037666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939033.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 91890037666 in words is "ninety-one billion, eight hundred ninety million, thirty-seven thousand, six hundred sixty-six".