55567661 has 2 divisors, whose sum is σ = 55567662. Its totient is φ = 55567660.

The previous prime is 55567651. The next prime is 55567663. The reversal of 55567661 is 16676555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41203561 + 14364100 = 6419^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 55567661 - 2¹⁴ = 55551277 is a prime.

Together with 55567663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55567663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27783830 + 27783831.

It is an arithmetic number, because the mean of its divisors is an integer number (27783831).

Almost surely, 2^55567661 is an apocalyptic number.

It is an amenable number.

55567661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55567661 is an equidigital number, since it uses as much as digits as its factorization.

55567661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 41.

The square root of 55567661 is about 7454.3719386679. The cubic root of 55567661 is about 381.5991267210.

The spelling of 55567661 in words is "fifty-five million, five hundred sixty-seven thousand, six hundred sixty-one".