552621661 has 2 divisors, whose sum is σ = 552621662. Its totient is φ = 552621660.

The previous prime is 552621659. The next prime is 552621673. The reversal of 552621661 is 166126255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432390436 + 120231225 = 20794^2 + 10965^2 .

It is a cyclic number.

It is not a de Polignac number, because 552621661 - 2¹ = 552621659 is a prime.

Together with 552621659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (552621611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276310830 + 276310831.

It is an arithmetic number, because the mean of its divisors is an integer number (276310831).

Almost surely, 2^552621661 is an apocalyptic number.

It is an amenable number.

552621661 is a deficient number, since it is larger than the sum of its proper divisors (1).

552621661 is an equidigital number, since it uses as much as digits as its factorization.

552621661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 552621661 is about 23507.9063508429. The cubic root of 552621661 is about 820.6210152870.

The spelling of 552621661 in words is "five hundred fifty-two million, six hundred twenty-one thousand, six hundred sixty-one".