18812865601 has 8 divisors (see below), whose sum is σ = 19972914984. Its totient is φ = 17658750720.

The previous prime is 18812865583. The next prime is 18812865649. The reversal of 18812865601 is 10656821881.

It is a Cunningham number, because it is equal to 137160²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 2081184400 + 16731681201 = 45620^2 + 129351^2 .

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 18812865601 - 2⁹ = 18812865089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18812865671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1477090 + ... + 1489771.

It is an arithmetic number, because the mean of its divisors is an integer number (2496614373).

Almost surely, 2^18812865601 is an apocalyptic number.

It is an amenable number.

18812865601 is a deficient number, since it is larger than the sum of its proper divisors (1160049383).

18812865601 is a wasteful number, since it uses less digits than its factorization.

18812865601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967251.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 18812865601 in words is "eighteen billion, eight hundred twelve million, eight hundred sixty-five thousand, six hundred one".