61065551 has 2 divisors, whose sum is σ = 61065552. Its totient is φ = 61065550.

The previous prime is 61065527. The next prime is 61065553. The reversal of 61065551 is 15556016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61065551 - 2¹⁴ = 61049167 is a prime.

Together with 61065553, 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 (61065553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30532775 + 30532776.

It is an arithmetic number, because the mean of its divisors is an integer number (30532776).

Almost surely, 2^61065551 is an apocalyptic number.

61065551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61065551 is an equidigital number, since it uses as much as digits as its factorization.

61065551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 61065551 is about 7814.4450218810. The cubic root of 61065551 is about 393.7906740212.

It can be divided in two parts, 61065 and 551, that added together give a palindrome (61616).

The spelling of 61065551 in words is "sixty-one million, sixty-five thousand, five hundred fifty-one".