18627678993 has 16 divisors (see below), whose sum is σ = 30965492736. Its totient is φ = 9676716240.

The previous prime is 18627678989. The next prime is 18627678997. The reversal of 18627678993 is 39987672681.

It is an interprime number because it is at equal distance from previous prime (18627678989) and next prime (18627678997).

It is not a de Polignac number, because 18627678993 - 2² = 18627678989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18627678997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40319421 + ... + 40319882.

It is an arithmetic number, because the mean of its divisors is an integer number (1935343296).

Almost surely, 2^18627678993 is an apocalyptic number.

It is an amenable number.

18627678993 is a deficient number, since it is larger than the sum of its proper divisors (12337813743).

18627678993 is a wasteful number, since it uses less digits than its factorization.

18627678993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80639324.

The product of its digits is 54867456, while the sum is 66.

The spelling of 18627678993 in words is "eighteen billion, six hundred twenty-seven million, six hundred seventy-eight thousand, nine hundred ninety-three".