61556 has 12 divisors (see below), whose sum is σ = 117600. Its totient is φ = 27960.

The previous prime is 61553. The next prime is 61559. The reversal of 61556 is 65516.

61556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61553) and next prime (61559).

It is a super-2 number, since 2×61556² = 7578282272, which contains 22 as substring.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (9800).

2⁶¹⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

61556 is a deficient number, since it is larger than the sum of its proper divisors (56044).

61556 is a wasteful number, since it uses less digits than its factorization.

61556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1412 counting only the distinct ones).

The product of its digits is 900, while the sum is 23.

The square root of 61556 is about 248.1048165595. The cubic root of 61556 is about 39.4842109625.

The spelling of 61556 in words is "sixty-one thousand, five hundred fifty-six".