13445557506 has 24 divisors (see below), whose sum is σ = 30136595580. Its totient is φ = 4327305696.

The previous prime is 13445557501. The next prime is 13445557519. The reversal of 13445557506 is 60575554431.

13445557506 is a `hidden beast` number, since 1 + 3 + 4 + 45 + 557 + 50 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12557219481 + 888338025 = 112059^2 + 29805^2 .

It is not an unprimeable number, because it can be changed into a prime (13445557501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12878365 + ... + 12879408.

Almost surely, 2^13445557506 is an apocalyptic number.

13445557506 is an abundant number, since it is smaller than the sum of its proper divisors (16691038074).

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

13445557506 is a wasteful number, since it uses less digits than its factorization.

13445557506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25757810 (or 25757807 counting only the distinct ones).

The product of its (nonzero) digits is 1260000, while the sum is 45.

The spelling of 13445557506 in words is "thirteen billion, four hundred forty-five million, five hundred fifty-seven thousand, five hundred six".