13607921065 has 16 divisors (see below), whose sum is σ = 17292930192. Its totient is φ = 10244265984.

The previous prime is 13607921051. The next prime is 13607921143. The reversal of 13607921065 is 56012970631.

It can be written as a sum of positive squares in 8 ways, for example, as 35904064 + 13572017001 = 5992^2 + 116499^2 .

It is a cyclic number.

It is not a de Polignac number, because 13607921065 - 2⁹ = 13607920553 is a prime.

It is a super-2 number, since 2×13607921065² (a number of 21 digits) contains 22 as substring.

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, 779917 + ... + 797173.

It is an arithmetic number, because the mean of its divisors is an integer number (1080808137).

Almost surely, 2^13607921065 is an apocalyptic number.

It is an amenable number.

13607921065 is a deficient number, since it is larger than the sum of its proper divisors (3685009127).

13607921065 is a wasteful number, since it uses less digits than its factorization.

13607921065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26556.

The product of its (nonzero) digits is 68040, while the sum is 40.

The spelling of 13607921065 in words is "thirteen billion, six hundred seven million, nine hundred twenty-one thousand, sixty-five".