18657894071 has 4 divisors (see below), whose sum is σ = 18659394600. Its totient is φ = 18656393544.

The previous prime is 18657894049. The next prime is 18657894083. The reversal of 18657894071 is 17049875681.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18657894071 is a prime.

It is a super-2 number, since 2×18657894071² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18657893998 and 18657894016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18657894001) 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, 731456 + ... + 756533.

It is an arithmetic number, because the mean of its divisors is an integer number (4664848650).

Almost surely, 2^18657894071 is an apocalyptic number.

18657894071 is a deficient number, since it is larger than the sum of its proper divisors (1500529).

18657894071 is a wasteful number, since it uses less digits than its factorization.

18657894071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500528.

The product of its (nonzero) digits is 3386880, while the sum is 56.

The spelling of 18657894071 in words is "eighteen billion, six hundred fifty-seven million, eight hundred ninety-four thousand, seventy-one".