61666005 has 8 divisors (see below), whose sum is σ = 98665632. Its totient is φ = 32888528.

The previous prime is 61665991. The next prime is 61666019. The reversal of 61666005 is 50066616.

It is an interprime number because it is at equal distance from previous prime (61665991) and next prime (61666019).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61666005 - 2⁵ = 61665973 is a prime.

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, 2055519 + ... + 2055548.

It is an arithmetic number, because the mean of its divisors is an integer number (12333204).

Almost surely, 2^61666005 is an apocalyptic number.

It is an amenable number.

61666005 is a deficient number, since it is larger than the sum of its proper divisors (36999627).

61666005 is a wasteful number, since it uses less digits than its factorization.

61666005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111075.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 61666005 is about 7852.7705302014. The cubic root of 61666005 is about 395.0771734060.

The spelling of 61666005 in words is "sixty-one million, six hundred sixty-six thousand, five".