663071531 has 4 divisors (see below), whose sum is σ = 691900752. Its totient is φ = 634242312.

The previous prime is 663071527. The next prime is 663071537. The reversal of 663071531 is 135170366.

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 663071531 - 2² = 663071527 is a prime.

It is a super-2 number, since 2×663071531² = 879327710445367922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663071537) 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, 14414576 + ... + 14414621.

It is an arithmetic number, because the mean of its divisors is an integer number (172975188).

Almost surely, 2^663071531 is an apocalyptic number.

663071531 is a deficient number, since it is larger than the sum of its proper divisors (28829221).

663071531 is a wasteful number, since it uses less digits than its factorization.

663071531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28829220.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 663071531 is about 25750.1753586262. The cubic root of 663071531 is about 872.0073133487.

The spelling of 663071531 in words is "six hundred sixty-three million, seventy-one thousand, five hundred thirty-one".