61666029 has 20 divisors (see below), whose sum is σ = 92807484. Its totient is φ = 40803264.

The previous prime is 61666019. The next prime is 61666051. The reversal of 61666029 is 92066616.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49028004 + 12638025 = 7002^2 + 3555^2 .

It is not a de Polignac number, because 61666029 - 2¹³ = 61657837 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61665984 and 61666002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61666019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8319 + ... + 13875.

Almost surely, 2^61666029 is an apocalyptic number.

It is an amenable number.

61666029 is a deficient number, since it is larger than the sum of its proper divisors (31141455).

61666029 is a wasteful number, since it uses less digits than its factorization.

61666029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5706 (or 5697 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 61666029 is about 7852.7720583244. The cubic root of 61666029 is about 395.0772246598.

Adding to 61666029 its sum of digits (36), we get a triangular number (61666065 = T₁₁₁₀₅).

The spelling of 61666029 in words is "sixty-one million, six hundred sixty-six thousand, twenty-nine".