663696707 has 4 divisors (see below), whose sum is σ = 673602696. Its totient is φ = 653790720.

The previous prime is 663696689. The next prime is 663696739. The reversal of 663696707 is 707696366.

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

It is a cyclic number.

It is not a de Polignac number, because 663696707 - 2¹² = 663692611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663696757) 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, 4952894 + ... + 4953027.

It is an arithmetic number, because the mean of its divisors is an integer number (168400674).

Almost surely, 2^663696707 is an apocalyptic number.

663696707 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

663696707 is a deficient number, since it is larger than the sum of its proper divisors (9905989).

663696707 is an equidigital number, since it uses as much as digits as its factorization.

663696707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9905988.

The product of its (nonzero) digits is 1714608, while the sum is 50.

The square root of 663696707 is about 25762.3117557412. The cubic root of 663696707 is about 872.2812841923.

The spelling of 663696707 in words is "six hundred sixty-three million, six hundred ninety-six thousand, seven hundred seven".