665550487 has 36 divisors (see below), whose sum is σ = 843050520. Its totient is φ = 522057312.

The previous prime is 665550427. The next prime is 665550491. The reversal of 665550487 is 784055566.

It is a de Polignac number, because none of the positive numbers 2^k-665550487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665550407) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4788064 + ... + 4788202.

It is an arithmetic number, because the mean of its divisors is an integer number (23418070).

Almost surely, 2^665550487 is an apocalyptic number.

665550487 is a deficient number, since it is larger than the sum of its proper divisors (177500033).

665550487 is a wasteful number, since it uses less digits than its factorization.

665550487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 46.

The square root of 665550487 is about 25798.2651936133. The cubic root of 665550487 is about 873.0926560179.

The spelling of 665550487 in words is "six hundred sixty-five million, five hundred fifty thousand, four hundred eighty-seven".