13128772605 has 48 divisors (see below), whose sum is σ = 23034458880. Its totient is φ = 6381483264.

The previous prime is 13128772541. The next prime is 13128772639. The reversal of 13128772605 is 50627782131.

It is not a de Polignac number, because 13128772605 - 2⁶ = 13128772541 is a prime.

It is a super-2 number, since 2×13128772605² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 167487 + ... + 233043.

It is an arithmetic number, because the mean of its divisors is an integer number (479884560).

Almost surely, 2^13128772605 is an apocalyptic number.

13128772605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13128772605 is a deficient number, since it is larger than the sum of its proper divisors (9905686275).

13128772605 is a wasteful number, since it uses less digits than its factorization.

13128772605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65670 (or 65657 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 13128772605 in words is "thirteen billion, one hundred twenty-eight million, seven hundred seventy-two thousand, six hundred five".