88991906565 has 16 divisors (see below), whose sum is σ = 142444686528. Its totient is φ = 47443138176.

The previous prime is 88991906551. The next prime is 88991906599. The reversal of 88991906565 is 56560919988.

It is not a de Polignac number, because 88991906565 - 2⁶ = 88991906501 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 88991906496 and 88991906505.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1162419 + ... + 1236608.

It is an arithmetic number, because the mean of its divisors is an integer number (8902792908).

Almost surely, 2^88991906565 is an apocalyptic number.

It is an amenable number.

88991906565 is a deficient number, since it is larger than the sum of its proper divisors (53452779963).

88991906565 is a wasteful number, since it uses less digits than its factorization.

88991906565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401508.

The product of its (nonzero) digits is 41990400, while the sum is 66.

The spelling of 88991906565 in words is "eighty-eight billion, nine hundred ninety-one million, nine hundred six thousand, five hundred sixty-five".