663769693 has 4 divisors (see below), whose sum is σ = 698704960. Its totient is φ = 628834428.

The previous prime is 663769679. The next prime is 663769703. The reversal of 663769693 is 396967366.

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 663769693 - 2⁹ = 663769181 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 (663769663) 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, 17467605 + ... + 17467642.

It is an arithmetic number, because the mean of its divisors is an integer number (174676240).

Almost surely, 2^663769693 is an apocalyptic number.

It is an amenable number.

663769693 is a deficient number, since it is larger than the sum of its proper divisors (34935267).

663769693 is a wasteful number, since it uses less digits than its factorization.

663769693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34935266.

The product of its digits is 6613488, while the sum is 55.

The square root of 663769693 is about 25763.7282434045. The cubic root of 663769693 is about 872.3132576261.

The spelling of 663769693 in words is "six hundred sixty-three million, seven hundred sixty-nine thousand, six hundred ninety-three".