13261651506 has 32 divisors (see below), whose sum is σ = 30097370880. Its totient is φ = 4326495408.

The previous prime is 13261651493. The next prime is 13261651517. The reversal of 13261651506 is 60515616231.

13261651506 is a `hidden beast` number, since 1 + 32 + 61 + 65 + 1 + 506 = 666.

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, 2610081 + ... + 2615156.

It is an arithmetic number, because the mean of its divisors is an integer number (940542840).

Almost surely, 2^13261651506 is an apocalyptic number.

13261651506 is an abundant number, since it is smaller than the sum of its proper divisors (16835719374).

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

13261651506 is a wasteful number, since it uses less digits than its factorization.

13261651506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5225295 (or 5225289 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 13261651506 in words is "thirteen billion, two hundred sixty-one million, six hundred fifty-one thousand, five hundred six".