61656555 has 8 divisors (see below), whose sum is σ = 98650512. Its totient is φ = 32883488.

The previous prime is 61656547. The next prime is 61656559. The reversal of 61656555 is 55565616.

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 61656555 - 2³ = 61656547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61656559) 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, 2055204 + ... + 2055233.

It is an arithmetic number, because the mean of its divisors is an integer number (12331314).

Almost surely, 2^61656555 is an apocalyptic number.

61656555 is a deficient number, since it is larger than the sum of its proper divisors (36993957).

61656555 is a wasteful number, since it uses less digits than its factorization.

61656555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110445.

The product of its digits is 135000, while the sum is 39.

The square root of 61656555 is about 7852.1688086795. The cubic root of 61656555 is about 395.0569911893.

It can be divided in two parts, 6165 and 6555, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 61656555 in words is "sixty-one million, six hundred fifty-six thousand, five hundred fifty-five".