663537671 has 8 divisors (see below), whose sum is σ = 694591488. Its totient is φ = 633087000.

The previous prime is 663537653. The next prime is 663537673. The reversal of 663537671 is 176735366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663537671 is a prime.

It is a super-2 number, since 2×663537671² = 880564481672208482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663537673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148535 + ... + 152936.

It is an arithmetic number, because the mean of its divisors is an integer number (86823936).

Almost surely, 2^663537671 is an apocalyptic number.

663537671 is a deficient number, since it is larger than the sum of its proper divisors (31053817).

663537671 is a wasteful number, since it uses less digits than its factorization.

663537671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301573.

The product of its digits is 476280, while the sum is 44.

The square root of 663537671 is about 25759.2249689310. The cubic root of 663537671 is about 872.2116061768.

The spelling of 663537671 in words is "six hundred sixty-three million, five hundred thirty-seven thousand, six hundred seventy-one".