61556655 has 16 divisors (see below), whose sum is σ = 98676864. Its totient is φ = 32768160.

The previous prime is 61556639. The next prime is 61556659. The reversal of 61556655 is 55665516.

It is not a de Polignac number, because 61556655 - 2⁴ = 61556639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61556659) 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 15 ways as a sum of consecutive naturals, for example, 4972 + ... + 12158.

It is an arithmetic number, because the mean of its divisors is an integer number (6167304).

Almost surely, 2^61556655 is an apocalyptic number.

61556655 is a deficient number, since it is larger than the sum of its proper divisors (37120209).

61556655 is a wasteful number, since it uses less digits than its factorization.

61556655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7766.

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

The square root of 61556655 is about 7845.8049300247. The cubic root of 61556655 is about 394.8435100876.

The spelling of 61556655 in words is "sixty-one million, five hundred fifty-six thousand, six hundred fifty-five".