6665061506 has 4 divisors (see below), whose sum is σ = 9997592262. Its totient is φ = 3332530752.

The previous prime is 6665061479. The next prime is 6665061511. The reversal of 6665061506 is 6051605666.

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

It can be written as a sum of positive squares in only one way, i.e., 5563817281 + 1101244225 = 74591^2 + 33185^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1666265375 + ... + 1666265378.

Almost surely, 2^6665061506 is an apocalyptic number.

6665061506 is a deficient number, since it is larger than the sum of its proper divisors (3332530756).

6665061506 is a wasteful number, since it uses less digits than its factorization.

6665061506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332530755.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 6665061506 is about 81639.8279395541. The cubic root of 6665061506 is about 1881.9209942354.

The spelling of 6665061506 in words is "six billion, six hundred sixty-five million, sixty-one thousand, five hundred six".