545544661 has 2 divisors, whose sum is σ = 545544662. Its totient is φ = 545544660.

The previous prime is 545544563. The next prime is 545544683. The reversal of 545544661 is 166445545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543775761 + 1768900 = 23319^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 545544661 - 2²⁷ = 411326933 is a prime.

It is a super-3 number, since 3×545544661³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545542661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272772330 + 272772331.

It is an arithmetic number, because the mean of its divisors is an integer number (272772331).

Almost surely, 2^545544661 is an apocalyptic number.

It is an amenable number.

545544661 is a deficient number, since it is larger than the sum of its proper divisors (1).

545544661 is an equidigital number, since it uses as much as digits as its factorization.

545544661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 40.

The square root of 545544661 is about 23356.8975037354. The cubic root of 545544661 is about 817.1029340456.

The spelling of 545544661 in words is "five hundred forty-five million, five hundred forty-four thousand, six hundred sixty-one".