123129278833 has 4 divisors (see below), whose sum is σ = 134322849648. Its totient is φ = 111935708020.

The previous prime is 123129278807. The next prime is 123129278927. The reversal of 123129278833 is 338872921321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123129278833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123129278933) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5596785391 + ... + 5596785412.

It is an arithmetic number, because the mean of its divisors is an integer number (33580712412).

Almost surely, 2^123129278833 is an apocalyptic number.

It is an amenable number.

123129278833 is a deficient number, since it is larger than the sum of its proper divisors (11193570815).

123129278833 is a wasteful number, since it uses less digits than its factorization.

123129278833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11193570814.

The product of its digits is 870912, while the sum is 49.

The spelling of 123129278833 in words is "one hundred twenty-three billion, one hundred twenty-nine million, two hundred seventy-eight thousand, eight hundred thirty-three".