18950749999 has 4 divisors (see below), whose sum is σ = 19030042080. Its totient is φ = 18871457920.

The previous prime is 18950749997. The next prime is 18950750047. The reversal of 18950749999 is 99994705981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99994705981 = 647 ⋅154551323.

It is a cyclic number.

It is not a de Polignac number, because 18950749999 - 2¹ = 18950749997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18950749997) 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, 39645682 + ... + 39646159.

It is an arithmetic number, because the mean of its divisors is an integer number (4757510520).

Almost surely, 2^18950749999 is an apocalyptic number.

18950749999 is a deficient number, since it is larger than the sum of its proper divisors (79292081).

18950749999 is an equidigital number, since it uses as much as digits as its factorization.

18950749999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79292080.

The product of its (nonzero) digits is 66134880, while the sum is 70.

The spelling of 18950749999 in words is "eighteen billion, nine hundred fifty million, seven hundred forty-nine thousand, nine hundred ninety-nine".