61660055 has 8 divisors (see below), whose sum is σ = 74180832. Its totient is φ = 49202208.

The previous prime is 61660051. The next prime is 61660069. The reversal of 61660055 is 55006616.

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 61660055 - 2² = 61660051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660051) 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 7 ways as a sum of consecutive naturals, for example, 13547 + ... + 17516.

It is an arithmetic number, because the mean of its divisors is an integer number (9272604).

Almost surely, 2^61660055 is an apocalyptic number.

61660055 is a deficient number, since it is larger than the sum of its proper divisors (12520777).

61660055 is a wasteful number, since it uses less digits than its factorization.

61660055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31465.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 61660055 is about 7852.3916738787. The cubic root of 61660055 is about 395.0644663248.

The spelling of 61660055 in words is "sixty-one million, six hundred sixty thousand, fifty-five".