18393661445 has 64 divisors (see below), whose sum is σ = 24581154240. Its totient is φ = 13154254848.

The previous prime is 18393661421. The next prime is 18393661469. The reversal of 18393661445 is 54416639381.

It is an interprime number because it is at equal distance from previous prime (18393661421) and next prime (18393661469).

It can be written as a sum of positive squares in 32 ways, for example, as 12669528481 + 5724132964 = 112559^2 + 75658^2 .

It is a cyclic number.

It is not a de Polignac number, because 18393661445 - 2¹⁰ = 18393660421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18393661393 and 18393661402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25942751 + ... + 25943459.

It is an arithmetic number, because the mean of its divisors is an integer number (384080535).

Almost surely, 2^18393661445 is an apocalyptic number.

It is an amenable number.

18393661445 is a deficient number, since it is larger than the sum of its proper divisors (6187492795).

18393661445 is a wasteful number, since it uses less digits than its factorization.

18393661445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954.

The product of its digits is 1866240, while the sum is 50.

The spelling of 18393661445 in words is "eighteen billion, three hundred ninety-three million, six hundred sixty-one thousand, four hundred forty-five".