999997538090859 has 128 divisors (see below), whose sum is σ = 1910885769216000. Its totient is φ = 501524812252800.

The previous prime is 999997538090753. The next prime is 999997538090923. The reversal of 999997538090859 is 958090835799999.

999997538090859 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 9 + 7 + 538 + 0 + 9 + 0 + 8 + 59 = 666.

It is not a de Polignac number, because 999997538090859 - 2²¹ = 999997535993707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (99).

It is a self number, because there is not a number n which added to its sum of digits gives 999997538090859.

It is not an unprimeable number, because it can be changed into a prime (999997538090659) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 737223954 + ... + 738579144.

It is an arithmetic number, because the mean of its divisors is an integer number (14928795072000).

Almost surely, 2^{999997538090859} is an apocalyptic number.

999997538090859 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

999997538090859 is a deficient number, since it is larger than the sum of its proper divisors (910888231125141).

999997538090859 is a wasteful number, since it uses less digits than its factorization.

999997538090859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367486 (or 1367480 counting only the distinct ones).

The product of its (nonzero) digits is 160707758400, while the sum is 99.

The spelling of 999997538090859 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred thirty-eight million, ninety thousand, eight hundred fifty-nine".