61558 has 8 divisors (see below), whose sum is σ = 105552. Its totient is φ = 26376.

The previous prime is 61553. The next prime is 61559. The reversal of 61558 is 85516.

It is a sphenic number, since it is the product of 3 distinct primes.

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.

61558 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185 + ... + 2212.

It is an arithmetic number, because the mean of its divisors is an integer number (13194).

2⁶¹⁵⁵⁸ is an apocalyptic number.

61558 is a deficient number, since it is larger than the sum of its proper divisors (43994).

61558 is a wasteful number, since it uses less digits than its factorization.

61558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406.

The product of its digits is 1200, while the sum is 25.

The square root of 61558 is about 248.1088470813. The cubic root of 61558 is about 39.4846385816.

The spelling of 61558 in words is "sixty-one thousand, five hundred fifty-eight".