654166553 has 4 divisors (see below), whose sum is σ = 654934308. Its totient is φ = 653398800.

The previous prime is 654166547. The next prime is 654166577. The reversal of 654166553 is 355661456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 365268544 + 288898009 = 19112^2 + 16997^2 .

It is a cyclic number.

It is not a de Polignac number, because 654166553 - 2⁴ = 654166537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 654166553.

It is not an unprimeable number, because it can be changed into a prime (654166853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382598 + ... + 384303.

It is an arithmetic number, because the mean of its divisors is an integer number (163733577).

Almost surely, 2^654166553 is an apocalyptic number.

It is an amenable number.

654166553 is a deficient number, since it is larger than the sum of its proper divisors (767755).

654166553 is an equidigital number, since it uses as much as digits as its factorization.

654166553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767754.

The product of its digits is 324000, while the sum is 41.

The square root of 654166553 is about 25576.6798666285. The cubic root of 654166553 is about 868.0860523498.

The spelling of 654166553 in words is "six hundred fifty-four million, one hundred sixty-six thousand, five hundred fifty-three".