13123001555 has 32 divisors (see below), whose sum is σ = 17027487360. Its totient is φ = 9679380480.

The previous prime is 13123001543. The next prime is 13123001557. The reversal of 13123001555 is 55510032131.

It is a happy number.

It is not a de Polignac number, because 13123001555 - 2²⁶ = 13055892691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13123001557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2201459 + ... + 2207411.

It is an arithmetic number, because the mean of its divisors is an integer number (532108980).

Almost surely, 2^13123001555 is an apocalyptic number.

13123001555 is a deficient number, since it is larger than the sum of its proper divisors (3904485805).

13123001555 is a wasteful number, since it uses less digits than its factorization.

13123001555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671.

The product of its (nonzero) digits is 2250, while the sum is 26.

Adding to 13123001555 its reverse (55510032131), we get a palindrome (68633033686).

The spelling of 13123001555 in words is "thirteen billion, one hundred twenty-three million, one thousand, five hundred fifty-five".