18351666658 has 16 divisors (see below), whose sum is σ = 29693386296. Its totient is φ = 8456175360.

The previous prime is 18351666653. The next prime is 18351666661. The reversal of 18351666658 is 85666615381.

It can be written as a sum of positive squares in 4 ways, for example, as 9950661009 + 8401005649 = 99753^2 + 91657^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18351666599 and 18351666608.

It is not an unprimeable number, because it can be changed into a prime (18351666653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559783 + ... + 591658.

Almost surely, 2^18351666658 is an apocalyptic number.

18351666658 is a deficient number, since it is larger than the sum of its proper divisors (11341719638).

18351666658 is a wasteful number, since it uses less digits than its factorization.

18351666658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152069.

The product of its digits is 6220800, while the sum is 55.

The spelling of 18351666658 in words is "eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, six hundred fifty-eight".