61669 has 4 divisors (see below), whose sum is σ = 62496. Its totient is φ = 60844.

The previous prime is 61667. The next prime is 61673. The reversal of 61669 is 96616.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 61669 - 2¹ = 61667 is a prime.

It is a super-2 number, since 2×61669² = 7606131122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61667) 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, 289 + ... + 454.

It is an arithmetic number, because the mean of its divisors is an integer number (15624).

2⁶¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

61669 is a deficient number, since it is larger than the sum of its proper divisors (827).

61669 is an equidigital number, since it uses as much as digits as its factorization.

61669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its digits is 1944, while the sum is 28.

The square root of 61669 is about 248.3324384771. The cubic root of 61669 is about 39.5083569350.

The spelling of 61669 in words is "sixty-one thousand, six hundred sixty-nine".