18649726097 has 4 divisors (see below), whose sum is σ = 18662778420. Its totient is φ = 18636673776.

The previous prime is 18649726079. The next prime is 18649726133. The reversal of 18649726097 is 79062794681.

It is a Cunningham number, because it is equal to 136564²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1257127936 + 17392598161 = 35456^2 + 131881^2 .

It is a cyclic number.

It is not a de Polignac number, because 18649726097 - 2⁶ = 18649726033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18649726297) 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 3 ways as a sum of consecutive naturals, for example, 6524018 + ... + 6526875.

It is an arithmetic number, because the mean of its divisors is an integer number (4665694605).

Almost surely, 2^18649726097 is an apocalyptic number.

It is an amenable number.

18649726097 is a deficient number, since it is larger than the sum of its proper divisors (13052323).

18649726097 is a wasteful number, since it uses less digits than its factorization.

18649726097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052322.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 18649726097 in words is "eighteen billion, six hundred forty-nine million, seven hundred twenty-six thousand, ninety-seven".