661796 has 6 divisors (see below), whose sum is σ = 1158150. Its totient is φ = 330896.

The previous prime is 661777. The next prime is 661823. The reversal of 661796 is 697166.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 440896 + 220900 = 664^2 + 470^2 .

It is an unprimeable number.

661796 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82721 + ... + 82728.

It is an arithmetic number, because the mean of its divisors is an integer number (193025).

2⁶⁶¹⁷⁹⁶ is an apocalyptic number.

It is an amenable number.

661796 is a deficient number, since it is larger than the sum of its proper divisors (496354).

661796 is a wasteful number, since it uses less digits than its factorization.

661796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165453 (or 165451 counting only the distinct ones).

The product of its digits is 13608, while the sum is 35.

The square root of 661796 is about 813.5084510932. The cubic root of 661796 is about 87.1447802905.

The spelling of 661796 in words is "six hundred sixty-one thousand, seven hundred ninety-six".