91066402550 has 24 divisors (see below), whose sum is σ = 171060582672. Its totient is φ = 36065900000.

The previous prime is 91066402543. The next prime is 91066402573. The reversal of 91066402550 is 5520466019.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9011426 + ... + 9021525.

It is an arithmetic number, because the mean of its divisors is an integer number (7127524278).

Almost surely, 2^91066402550 is an apocalyptic number.

91066402550 is a deficient number, since it is larger than the sum of its proper divisors (79994180122).

91066402550 is a wasteful number, since it uses less digits than its factorization.

91066402550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18033064 (or 18033059 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 91066402550 its reverse (5520466019), we get a palindrome (96586868569).

The spelling of 91066402550 in words is "ninety-one billion, sixty-six million, four hundred two thousand, five hundred fifty".