123351520155 has 64 divisors (see below), whose sum is σ = 207416885760. Its totient is φ = 62510063616.

The previous prime is 123351520037. The next prime is 123351520157. The reversal of 123351520155 is 551025153321.

It is a happy number.

It is not a de Polignac number, because 123351520155 - 2⁸ = 123351519899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123351520157) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58376379 + ... + 58378491.

It is an arithmetic number, because the mean of its divisors is an integer number (3240888840).

Almost surely, 2^123351520155 is an apocalyptic number.

123351520155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123351520155 is a deficient number, since it is larger than the sum of its proper divisors (84065365605).

123351520155 is a wasteful number, since it uses less digits than its factorization.

123351520155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220.

The product of its (nonzero) digits is 22500, while the sum is 33.

Adding to 123351520155 its reverse (551025153321), we get a palindrome (674376673476).

The spelling of 123351520155 in words is "one hundred twenty-three billion, three hundred fifty-one million, five hundred twenty thousand, one hundred fifty-five".