90921989555 has 16 divisors (see below), whose sum is σ = 113381856000. Its totient is φ = 69918775680.

The previous prime is 90921989527. The next prime is 90921989567. The reversal of 90921989555 is 55598912909.

It is not a de Polignac number, because 90921989555 - 2¹⁶ = 90921924019 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1945340 + ... + 1991529.

It is an arithmetic number, because the mean of its divisors is an integer number (7086366000).

Almost surely, 2^90921989555 is an apocalyptic number.

90921989555 is a deficient number, since it is larger than the sum of its proper divisors (22459866445).

90921989555 is a wasteful number, since it uses less digits than its factorization.

90921989555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937054.

The product of its (nonzero) digits is 13122000, while the sum is 62.

The spelling of 90921989555 in words is "ninety billion, nine hundred twenty-one million, nine hundred eighty-nine thousand, five hundred fifty-five".