18973453551 has 32 divisors (see below), whose sum is σ = 29841255360. Its totient is φ = 10610202624.

The previous prime is 18973453537. The next prime is 18973453573. The reversal of 18973453551 is 15535437981.

It is not a de Polignac number, because 18973453551 - 2⁷ = 18973453423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 18973453494 and 18973453503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18973453511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 474180 + ... + 512633.

It is an arithmetic number, because the mean of its divisors is an integer number (932539230).

Almost surely, 2^18973453551 is an apocalyptic number.

18973453551 is a deficient number, since it is larger than the sum of its proper divisors (10867801809).

18973453551 is a wasteful number, since it uses less digits than its factorization.

18973453551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986875.

The product of its digits is 2268000, while the sum is 51.

The spelling of 18973453551 in words is "eighteen billion, nine hundred seventy-three million, four hundred fifty-three thousand, five hundred fifty-one".