661622 has 8 divisors (see below), whose sum is σ = 1068816. Its totient is φ = 305352.

The previous prime is 661621. The next prime is 661663. The reversal of 661622 is 226166.

661622 is nontrivially palindromic in base 12.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661621) 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, 12698 + ... + 12749.

It is an arithmetic number, because the mean of its divisors is an integer number (133602).

2⁶⁶¹⁶²² is an apocalyptic number.

661622 is a deficient number, since it is larger than the sum of its proper divisors (407194).

661622 is a wasteful number, since it uses less digits than its factorization.

661622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25462.

The product of its digits is 864, while the sum is 23.

The square root of 661622 is about 813.4014998757. The cubic root of 661622 is about 87.1371422264.

Adding to 661622 its reverse (226166), we get a palindrome (887788).

The spelling of 661622 in words is "six hundred sixty-one thousand, six hundred twenty-two".