61655 has 16 divisors (see below), whose sum is σ = 86400. Its totient is φ = 41760.

The previous prime is 61651. The next prime is 61657. The reversal of 61655 is 55616.

61655 = 30² + 31² + ... + 59².

It is not a de Polignac number, because 61655 - 2² = 61651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61655.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 61655.

It is not an unprimeable number, because it can be changed into a prime (61651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1016 + ... + 1074.

It is an arithmetic number, because the mean of its divisors is an integer number (5400).

2⁶¹⁶⁵⁵ is an apocalyptic number.

61655 is a deficient number, since it is larger than the sum of its proper divisors (24745).

61655 is a wasteful number, since it uses less digits than its factorization.

61655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94.

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

The square root of 61655 is about 248.3042488561. The cubic root of 61655 is about 39.5053670003.

It can be divided in two parts, 6 and 1655, that added together give a palindrome (1661).

The spelling of 61655 in words is "sixty-one thousand, six hundred fifty-five".