61666004 has 24 divisors (see below), whose sum is σ = 115453800. Its totient is φ = 28717056.

The previous prime is 61665991. The next prime is 61666019. The reversal of 61666004 is 40066616.

61666004 = 167² + 168² + ... + 574².

It can be written as a sum of positive squares in 4 ways, for example, as 26832400 + 34833604 = 5180^2 + 5902^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1922 + ... + 11270.

It is an arithmetic number, because the mean of its divisors is an integer number (4810575).

Almost surely, 2^61666004 is an apocalyptic number.

It is an amenable number.

61666004 is a deficient number, since it is larger than the sum of its proper divisors (53787796).

61666004 is a wasteful number, since it uses less digits than its factorization.

61666004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9467 (or 9465 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 61666004 is about 7852.7704665296. The cubic root of 61666004 is about 395.0771712704.

The spelling of 61666004 in words is "sixty-one million, six hundred sixty-six thousand, four".