61653 has 4 divisors (see below), whose sum is σ = 82208. Its totient is φ = 41100.

The previous prime is 61651. The next prime is 61657. The reversal of 61653 is 35616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61653 - 2¹ = 61651 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 10273 + ... + 10278.

It is an arithmetic number, because the mean of its divisors is an integer number (20552).

2⁶¹⁶⁵³ is an apocalyptic number.

It is an amenable number.

61653 is a deficient number, since it is larger than the sum of its proper divisors (20555).

61653 is a wasteful number, since it uses less digits than its factorization.

61653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20554.

The product of its digits is 540, while the sum is 21.

The square root of 61653 is about 248.3002215061. The cubic root of 61653 is about 39.5049398298.

The spelling of 61653 in words is "sixty-one thousand, six hundred fifty-three".