123012315453534 has 128 divisors (see below), whose sum is σ = 282366840913920. Its totient is φ = 35432060805504.

The previous prime is 123012315453509. The next prime is 123012315453551. The reversal of 123012315453534 is 435354513210321.

It is a super-2 number, since 2×123012315453534² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2433982437 + ... + 2434032975.

It is an arithmetic number, because the mean of its divisors is an integer number (2205990944640).

Almost surely, 2^{123012315453534} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123012315453534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141183420456960).

123012315453534 is an abundant number, since it is smaller than the sum of its proper divisors (159354525460386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123012315453534 is a wasteful number, since it uses less digits than its factorization.

123012315453534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79494.

The product of its (nonzero) digits is 648000, while the sum is 42.

Adding to 123012315453534 its reverse (435354513210321), we get a palindrome (558366828663855).

The spelling of 123012315453534 in words is "one hundred twenty-three trillion, twelve billion, three hundred fifteen million, four hundred fifty-three thousand, five hundred thirty-four".