123381806559 has 16 divisors (see below), whose sum is σ = 190021178880. Its totient is φ = 70378213760.

The previous prime is 123381806557. The next prime is 123381806573. The reversal of 123381806559 is 955608183321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123381806559 - 2¹ = 123381806557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123381806557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109965399 + ... + 109966520.

It is an arithmetic number, because the mean of its divisors is an integer number (11876323680).

Almost surely, 2^123381806559 is an apocalyptic number.

123381806559 is a deficient number, since it is larger than the sum of its proper divisors (66639372321).

123381806559 is a wasteful number, since it uses less digits than its factorization.

123381806559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219931950.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 123381806559 in words is "one hundred twenty-three billion, three hundred eighty-one million, eight hundred six thousand, five hundred fifty-nine".