61556066 has 32 divisors (see below), whose sum is σ = 109601856. Its totient is φ = 25560000.

The previous prime is 61556059. The next prime is 61556071. The reversal of 61556066 is 66065516.

61556066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61556066² = 7578298522792712, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27821 + ... + 29951.

It is an arithmetic number, because the mean of its divisors is an integer number (3425058).

Almost surely, 2^61556066 is an apocalyptic number.

61556066 is a deficient number, since it is larger than the sum of its proper divisors (48045790).

61556066 is a wasteful number, since it uses less digits than its factorization.

61556066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 61556066 is about 7845.7673939520. The cubic root of 61556066 is about 394.8422507406.

It can be divided in two parts, 6155 and 6066, that added together give a palindrome (12221).

The spelling of 61556066 in words is "sixty-one million, five hundred fifty-six thousand, sixty-six".