123319537805 has 16 divisors (see below), whose sum is σ = 158183794944. Its totient is φ = 92064635520.

The previous prime is 123319537717. The next prime is 123319537811. The reversal of 123319537805 is 508735913321.

It is a de Polignac number, because none of the positive numbers 2^k-123319537805 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123319537805.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 13072649 + ... + 13082078.

It is an arithmetic number, because the mean of its divisors is an integer number (9886487184).

Almost surely, 2^123319537805 is an apocalyptic number.

It is an amenable number.

123319537805 is a deficient number, since it is larger than the sum of its proper divisors (34864257139).

123319537805 is a wasteful number, since it uses less digits than its factorization.

123319537805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26154796.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 123319537805 in words is "one hundred twenty-three billion, three hundred nineteen million, five hundred thirty-seven thousand, eight hundred five".