123303121551 has 12 divisors (see below), whose sum is σ = 178119057480. Its totient is φ = 82195366320.

The previous prime is 123303121547. The next prime is 123303121619. The reversal of 123303121551 is 155121303321.

123303121551 is a `hidden beast` number, since 1 + 2 + 330 + 312 + 15 + 5 + 1 = 666.

It is not a de Polignac number, because 123303121551 - 2² = 123303121547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123303121451) 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 11 ways as a sum of consecutive naturals, for example, 441960 + ... + 664781.

It is an arithmetic number, because the mean of its divisors is an integer number (14843254790).

Almost surely, 2^123303121551 is an apocalyptic number.

123303121551 is a deficient number, since it is larger than the sum of its proper divisors (54815935929).

123303121551 is a wasteful number, since it uses less digits than its factorization.

123303121551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119126 (or 1119123 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

Adding to 123303121551 its reverse (155121303321), we get a palindrome (278424424872).

The spelling of 123303121551 in words is "one hundred twenty-three billion, three hundred three million, one hundred twenty-one thousand, five hundred fifty-one".