90999999999999 has 12 divisors (see below), whose sum is σ = 131468098366696. Its totient is φ = 60655749471792.

The previous prime is 90999999999913. The next prime is 91000000000003. The reversal of 90999999999999 is 99999999999909.

It is not a de Polignac number, because 90999999999999 - 2¹⁹ = 90999999475711 is a prime.

It is a super-9 number, since 9×90999999999999⁹ (a number of 127 digits) contains 999999999 as substring.

It is a Duffinian number.

90999999999999 is a modest number, since divided by 9999999 gives 9099999 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 90999999999891 and 90999999999900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90999999999899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 909713449 + ... + 909813474.

Almost surely, 2^{90999999999999} is an apocalyptic number.

90999999999999 is a deficient number, since it is larger than the sum of its proper divisors (40468098366697).

90999999999999 is a wasteful number, since it uses less digits than its factorization.

90999999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819532486 (or 1819532483 counting only the distinct ones).

The product of its (nonzero) digits is 2541865828329, while the sum is 117.

The spelling of 90999999999999 in words is "ninety trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".