123122309985 has 32 divisors (see below), whose sum is σ = 220226993280. Its totient is φ = 65262366144.

The previous prime is 123122309951. The next prime is 123122310007. The reversal of 123122309985 is 589903221321.

123122309985 is a `hidden beast` number, since 1 + 231 + 22 + 309 + 98 + 5 = 666.

It is not a de Polignac number, because 123122309985 - 2¹¹ = 123122307937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 123122309985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2775594 + ... + 2819603.

It is an arithmetic number, because the mean of its divisors is an integer number (6882093540).

Almost surely, 2^123122309985 is an apocalyptic number.

123122309985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123122309985 is a deficient number, since it is larger than the sum of its proper divisors (97104683295).

123122309985 is a wasteful number, since it uses less digits than its factorization.

123122309985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5595374 (or 5595368 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 123122309985 in words is "one hundred twenty-three billion, one hundred twenty-two million, three hundred nine thousand, nine hundred eighty-five".