18963538497 has 6 divisors (see below), whose sum is σ = 27391777842. Its totient is φ = 12642358992.

The previous prime is 18963538483. The next prime is 18963538499. The reversal of 18963538497 is 79483536981.

18963538497 is a `hidden beast` number, since 1 + 8 + 9 + 6 + 3 + 538 + 4 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17083535616 + 1880002881 = 130704^2 + 43359^2 .

It is not a de Polignac number, because 18963538497 - 2⁴ = 18963538481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18963538499) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1053529908 + ... + 1053529925.

It is an arithmetic number, because the mean of its divisors is an integer number (4565296307).

Almost surely, 2^18963538497 is an apocalyptic number.

It is an amenable number.

18963538497 is a deficient number, since it is larger than the sum of its proper divisors (8428239345).

18963538497 is a wasteful number, since it uses less digits than its factorization.

18963538497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107059839 (or 2107059836 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 18963538497 in words is "eighteen billion, nine hundred sixty-three million, five hundred thirty-eight thousand, four hundred ninety-seven".