18649387695 has 8 divisors (see below), whose sum is σ = 29839020336. Its totient is φ = 9946340096.

The previous prime is 18649387663. The next prime is 18649387697. The reversal of 18649387695 is 59678394681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18649387695 - 2⁵ = 18649387663 is a prime.

It is a super-2 number, since 2×18649387695² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18649387697) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 621646242 + ... + 621646271.

It is an arithmetic number, because the mean of its divisors is an integer number (3729877542).

Almost surely, 2^18649387695 is an apocalyptic number.

18649387695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18649387695 is a deficient number, since it is larger than the sum of its proper divisors (11189632641).

18649387695 is a wasteful number, since it uses less digits than its factorization.

18649387695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243292521.

The product of its digits is 78382080, while the sum is 66.

The spelling of 18649387695 in words is "eighteen billion, six hundred forty-nine million, three hundred eighty-seven thousand, six hundred ninety-five".