18657894073 has 16 divisors (see below), whose sum is σ = 22973633536. Its totient is φ = 14755815360.

The previous prime is 18657894049. The next prime is 18657894083. The reversal of 18657894073 is 37049875681.

It is not a de Polignac number, because 18657894073 - 2²¹ = 18655796921 is a prime.

It is a super-2 number, since 2×18657894073² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18657893999 and 18657894017.

It is not an unprimeable number, because it can be changed into a prime (18657894023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169240 + ... + 256822.

It is an arithmetic number, because the mean of its divisors is an integer number (1435852096).

Almost surely, 2^18657894073 is an apocalyptic number.

18657894073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18657894073 is a deficient number, since it is larger than the sum of its proper divisors (4315739463).

18657894073 is a wasteful number, since it uses less digits than its factorization.

18657894073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89944.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 18657894073 in words is "eighteen billion, six hundred fifty-seven million, eight hundred ninety-four thousand, seventy-three".