18574454551 has 2 divisors, whose sum is σ = 18574454552. Its totient is φ = 18574454550.

The previous prime is 18574454489. The next prime is 18574454621. The reversal of 18574454551 is 15545447581.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18574454551 - 2¹¹ = 18574452503 is a prime.

It is a super-2 number, since 2×18574454551² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18574454495 and 18574454504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18574454651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9287227275 + 9287227276.

It is an arithmetic number, because the mean of its divisors is an integer number (9287227276).

Almost surely, 2^18574454551 is an apocalyptic number.

18574454551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18574454551 is an equidigital number, since it uses as much as digits as its factorization.

18574454551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240000, while the sum is 49.

The spelling of 18574454551 in words is "eighteen billion, five hundred seventy-four million, four hundred fifty-four thousand, five hundred fifty-one".