61666044 has 48 divisors (see below), whose sum is σ = 157463040. Its totient is φ = 18627840.

The previous prime is 61666019. The next prime is 61666051. The reversal of 61666044 is 44066616.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 61665996 and 61666014.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 60612 + ... + 61620.

It is an arithmetic number, because the mean of its divisors is an integer number (3280480).

Almost surely, 2^61666044 is an apocalyptic number.

It is an amenable number.

61666044 is an abundant number, since it is smaller than the sum of its proper divisors (95796996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61666044 is a wasteful number, since it uses less digits than its factorization.

61666044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 61666044 is about 7852.7730134011. The cubic root of 61666044 is about 395.0772566934.

The spelling of 61666044 in words is "sixty-one million, six hundred sixty-six thousand, forty-four".