663187071 has 4 divisors (see below), whose sum is σ = 884249432. Its totient is φ = 442124712.

The previous prime is 663187009. The next prime is 663187079. The reversal of 663187071 is 170781366.

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

It is not a de Polignac number, because 663187071 - 2¹⁰ = 663186047 is a prime.

It is a super-2 number, since 2×663187071² = 879634182283118082, 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 (663187079) 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, 110531176 + ... + 110531181.

It is an arithmetic number, because the mean of its divisors is an integer number (221062358).

Almost surely, 2^663187071 is an apocalyptic number.

663187071 is a deficient number, since it is larger than the sum of its proper divisors (221062361).

663187071 is a wasteful number, since it uses less digits than its factorization.

663187071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221062360.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 663187071 is about 25752.4187407707. The cubic root of 663187071 is about 872.0579594047.

The spelling of 663187071 in words is "six hundred sixty-three million, one hundred eighty-seven thousand, seventy-one".