663690953 has 4 divisors (see below), whose sum is σ = 664248468. Its totient is φ = 663133440.

The previous prime is 663690949. The next prime is 663690971. The reversal of 663690953 is 359096366.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 546250384 + 117440569 = 23372^2 + 10837^2 .

It is a cyclic number.

It is not a de Polignac number, because 663690953 - 2² = 663690949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663690898 and 663690907.

It is not an unprimeable number, because it can be changed into a prime (663690943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276968 + ... + 279353.

It is an arithmetic number, because the mean of its divisors is an integer number (166062117).

Almost surely, 2^663690953 is an apocalyptic number.

It is an amenable number.

663690953 is a deficient number, since it is larger than the sum of its proper divisors (557515).

663690953 is a wasteful number, since it uses less digits than its factorization.

663690953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557514.

The product of its (nonzero) digits is 787320, while the sum is 47.

The square root of 663690953 is about 25762.2000807384. The cubic root of 663690953 is about 872.2787634018.

The spelling of 663690953 in words is "six hundred sixty-three million, six hundred ninety thousand, nine hundred fifty-three".