23218649999 has 4 divisors (see below), whose sum is σ = 23239933080. Its totient is φ = 23197366920.

The previous prime is 23218649977. The next prime is 23218650011. The reversal of 23218649999 is 99994681232.

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

It is a cyclic number.

It is not a de Polignac number, because 23218649999 - 2¹² = 23218645903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23218649959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10639904 + ... + 10642085.

It is an arithmetic number, because the mean of its divisors is an integer number (5809983270).

Almost surely, 2^23218649999 is an apocalyptic number.

23218649999 is a deficient number, since it is larger than the sum of its proper divisors (21283081).

23218649999 is a wasteful number, since it uses less digits than its factorization.

23218649999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21283080.

The product of its digits is 15116544, while the sum is 62.

The spelling of 23218649999 in words is "twenty-three billion, two hundred eighteen million, six hundred forty-nine thousand, nine hundred ninety-nine".