661703 has 4 divisors (see below), whose sum is σ = 756240. Its totient is φ = 567168.

The previous prime is 661697. The next prime is 661721. The reversal of 661703 is 307166.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 661703 - 2¹² = 657607 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 (661103) 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, 47258 + ... + 47271.

It is an arithmetic number, because the mean of its divisors is an integer number (189060).

2⁶⁶¹⁷⁰³ is an apocalyptic number.

661703 is a deficient number, since it is larger than the sum of its proper divisors (94537).

661703 is an equidigital number, since it uses as much as digits as its factorization.

661703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94536.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 661703 is about 813.4512892608. The cubic root of 661703 is about 87.1406980435.

Adding to 661703 its reverse (307166), we get a palindrome (968869).

The spelling of 661703 in words is "six hundred sixty-one thousand, seven hundred three".