547377661 has 2 divisors, whose sum is σ = 547377662. Its totient is φ = 547377660.

The previous prime is 547377647. The next prime is 547377683. The reversal of 547377661 is 166773745.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545923225 + 1454436 = 23365^2 + 1206^2 .

It is a cyclic number.

It is not a de Polignac number, because 547377661 - 2⁵ = 547377629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (547377601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273688830 + 273688831.

It is an arithmetic number, because the mean of its divisors is an integer number (273688831).

Almost surely, 2^547377661 is an apocalyptic number.

It is an amenable number.

547377661 is a deficient number, since it is larger than the sum of its proper divisors (1).

547377661 is an equidigital number, since it uses as much as digits as its factorization.

547377661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 46.

The square root of 547377661 is about 23396.1035431116. The cubic root of 547377661 is about 818.0170512922.

The spelling of 547377661 in words is "five hundred forty-seven million, three hundred seventy-seven thousand, six hundred sixty-one".