18020651368 has 8 divisors (see below), whose sum is σ = 33788721330. Its totient is φ = 9010325680.

The previous prime is 18020651333. The next prime is 18020651377. The reversal of 18020651368 is 86315602081.

It can be written as a sum of positive squares in only one way, i.e., 16138653444 + 1881997924 = 127038^2 + 43382^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18020651368.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1126290703 + ... + 1126290718.

Almost surely, 2^18020651368 is an apocalyptic number.

It is an amenable number.

18020651368 is a deficient number, since it is larger than the sum of its proper divisors (15768069962).

18020651368 is a wasteful number, since it uses less digits than its factorization.

18020651368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252581427 (or 2252581423 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 18020651368 in words is "eighteen billion, twenty million, six hundred fifty-one thousand, three hundred sixty-eight".