661793 has 8 divisors (see below), whose sum is σ = 764640. Its totient is φ = 566080.

The previous prime is 661777. The next prime is 661823. The reversal of 661793 is 397166.

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

It is a cyclic number.

It is not a de Polignac number, because 661793 - 2⁴ = 661777 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661093) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1583 + ... + 1956.

It is an arithmetic number, because the mean of its divisors is an integer number (95580).

2⁶⁶¹⁷⁹³ is an apocalyptic number.

It is an amenable number.

661793 is a deficient number, since it is larger than the sum of its proper divisors (102847).

661793 is a wasteful number, since it uses less digits than its factorization.

661793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567.

The product of its digits is 6804, while the sum is 32.

The square root of 661793 is about 813.5066072258. The cubic root of 661793 is about 87.1446486111.

Adding to 661793 its sum of digits (32), we get a triangular number (661825 = T₁₁₅₀).

The spelling of 661793 in words is "six hundred sixty-one thousand, seven hundred ninety-three".