61668829 has 2 divisors, whose sum is σ = 61668830. Its totient is φ = 61668828.

The previous prime is 61668823. The next prime is 61668833. The reversal of 61668829 is 92886616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50765625 + 10903204 = 7125^2 + 3302^2 .

It is a cyclic number.

It is not a de Polignac number, because 61668829 - 2¹³ = 61660637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61668823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30834414 + 30834415.

It is an arithmetic number, because the mean of its divisors is an integer number (30834415).

Almost surely, 2^61668829 is an apocalyptic number.

It is an amenable number.

61668829 is a deficient number, since it is larger than the sum of its proper divisors (1).

61668829 is an equidigital number, since it uses as much as digits as its factorization.

61668829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 61668829 is about 7852.9503372936. The cubic root of 61668829 is about 395.0832041783.

The spelling of 61668829 in words is "sixty-one million, six hundred sixty-eight thousand, eight hundred twenty-nine".