91820046550 has 24 divisors (see below), whose sum is σ = 170805219552. Its totient is φ = 36723732000.

The previous prime is 91820046509. The next prime is 91820046557. The reversal of 91820046550 is 5564002819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91820046557) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 344355 + ... + 549745.

It is an arithmetic number, because the mean of its divisors is an integer number (7116884148).

Almost surely, 2^91820046550 is an apocalyptic number.

91820046550 is a deficient number, since it is larger than the sum of its proper divisors (78985173002).

91820046550 is a wasteful number, since it uses less digits than its factorization.

91820046550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214344 (or 214339 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 91820046550 in words is "ninety-one billion, eight hundred twenty million, forty-six thousand, five hundred fifty".