663769 has 4 divisors (see below), whose sum is σ = 673744. Its totient is φ = 653796.

The previous prime is 663763. The next prime is 663787. The reversal of 663769 is 967366.

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 663769 - 2⁵ = 663737 is a prime.

It is a super-2 number, since 2×663769² = 881178570722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663763) 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, 4887 + ... + 5020.

It is an arithmetic number, because the mean of its divisors is an integer number (168436).

2⁶⁶³⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

663769 is a deficient number, since it is larger than the sum of its proper divisors (9975).

663769 is an equidigital number, since it uses as much as digits as its factorization.

663769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9974.

The product of its digits is 40824, while the sum is 37.

The square root of 663769 is about 814.7201973684. The cubic root of 663769 is about 87.2312954050.

The spelling of 663769 in words is "six hundred sixty-three thousand, seven hundred sixty-nine".