18950867553 has 4 divisors (see below), whose sum is σ = 25267823408. Its totient is φ = 12633911700.

The previous prime is 18950867491. The next prime is 18950867581. The reversal of 18950867553 is 35576805981.

It is a happy number.

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.

It is not a de Polignac number, because 18950867553 - 2⁸ = 18950867297 is a prime.

It is a super-2 number, since 2×18950867553² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18950867493 and 18950867502.

It is not an unprimeable number, because it can be changed into a prime (18950867153) 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, 3158477923 + ... + 3158477928.

It is an arithmetic number, because the mean of its divisors is an integer number (6316955852).

Almost surely, 2^18950867553 is an apocalyptic number.

It is an amenable number.

18950867553 is a deficient number, since it is larger than the sum of its proper divisors (6316955855).

18950867553 is an equidigital number, since it uses as much as digits as its factorization.

18950867553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316955854.

The product of its (nonzero) digits is 9072000, while the sum is 57.

The spelling of 18950867553 in words is "eighteen billion, nine hundred fifty million, eight hundred sixty-seven thousand, five hundred fifty-three".