18951135361 has 4 divisors (see below), whose sum is σ = 19775097792. Its totient is φ = 18127172932.

The previous prime is 18951135353. The next prime is 18951135367. The reversal of 18951135361 is 16353115981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16353115981 = 607 ⋅26940883.

It is a cyclic number.

It is not a de Polignac number, because 18951135361 - 2³ = 18951135353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18951135367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411981181 + ... + 411981226.

It is an arithmetic number, because the mean of its divisors is an integer number (4943774448).

Almost surely, 2^18951135361 is an apocalyptic number.

It is an amenable number.

18951135361 is a deficient number, since it is larger than the sum of its proper divisors (823962431).

18951135361 is an equidigital number, since it uses as much as digits as its factorization.

18951135361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823962430.

The product of its digits is 97200, while the sum is 43.

The spelling of 18951135361 in words is "eighteen billion, nine hundred fifty-one million, one hundred thirty-five thousand, three hundred sixty-one".