123540513355 has 16 divisors (see below), whose sum is σ = 170029946304. Its totient is φ = 84412016640.

The previous prime is 123540513311. The next prime is 123540513403. The reversal of 123540513355 is 553315045321.

It is not a de Polignac number, because 123540513355 - 2¹⁷ = 123540382283 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6270822 + ... + 6290491.

It is an arithmetic number, because the mean of its divisors is an integer number (10626871644).

Almost surely, 2^123540513355 is an apocalyptic number.

123540513355 is a deficient number, since it is larger than the sum of its proper divisors (46489432949).

123540513355 is a wasteful number, since it uses less digits than its factorization.

123540513355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12561606.

The product of its (nonzero) digits is 135000, while the sum is 37.

Adding to 123540513355 its reverse (553315045321), we get a palindrome (676855558676).

The spelling of 123540513355 in words is "one hundred twenty-three billion, five hundred forty million, five hundred thirteen thousand, three hundred fifty-five".