13618517649 has 32 divisors (see below), whose sum is σ = 20784411648. Its totient is φ = 7851096000.

The previous prime is 13618517629. The next prime is 13618517663. The reversal of 13618517649 is 94671581631.

It is a happy number.

13618517649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13618517649 - 2¹⁷ = 13618386577 is a prime.

It is a super-2 number, since 2×13618517649² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13618517609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87814 + ... + 186944.

It is an arithmetic number, because the mean of its divisors is an integer number (649512864).

Almost surely, 2^13618517649 is an apocalyptic number.

It is an amenable number.

13618517649 is a deficient number, since it is larger than the sum of its proper divisors (7165893999).

13618517649 is a wasteful number, since it uses less digits than its factorization.

13618517649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99349.

The product of its digits is 1088640, while the sum is 51.

The spelling of 13618517649 in words is "thirteen billion, six hundred eighteen million, five hundred seventeen thousand, six hundred forty-nine".