61666584 has 64 divisors (see below), whose sum is σ = 176774400. Its totient is φ = 17560704.

The previous prime is 61666573. The next prime is 61666589. The reversal of 61666584 is 48566616.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61666589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93247 + ... + 93905.

It is an arithmetic number, because the mean of its divisors is an integer number (2762100).

Almost surely, 2^61666584 is an apocalyptic number.

It is an amenable number.

61666584 is an abundant number, since it is smaller than the sum of its proper divisors (115107816).

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

61666584 is a wasteful number, since it uses less digits than its factorization.

61666584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 1228 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 61666584 is about 7852.8073960845. The cubic root of 61666584 is about 395.0784099001.

The spelling of 61666584 in words is "sixty-one million, six hundred sixty-six thousand, five hundred eighty-four".