123351520163 has 4 divisors (see below), whose sum is σ = 125976020640. Its totient is φ = 120727019688.

The previous prime is 123351520157. The next prime is 123351520177. The reversal of 123351520163 is 361025153321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123351520163 - 2¹⁶ = 123351454627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123351528163) 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, 1312250168 + ... + 1312250261.

It is an arithmetic number, because the mean of its divisors is an integer number (31494005160).

Almost surely, 2^123351520163 is an apocalyptic number.

123351520163 is a deficient number, since it is larger than the sum of its proper divisors (2624500477).

123351520163 is an equidigital number, since it uses as much as digits as its factorization.

123351520163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624500476.

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 123351520163 its reverse (361025153321), we get a palindrome (484376673484).

The spelling of 123351520163 in words is "one hundred twenty-three billion, three hundred fifty-one million, five hundred twenty thousand, one hundred sixty-three".