665756499 has 16 divisors (see below), whose sum is σ = 940466592. Its totient is φ = 417474048.

The previous prime is 665756491. The next prime is 665756537. The reversal of 665756499 is 994657566.

It is not a de Polignac number, because 665756499 - 2³ = 665756491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665756491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114097 + ... + 119789.

It is an arithmetic number, because the mean of its divisors is an integer number (58779162).

Almost surely, 2^665756499 is an apocalyptic number.

665756499 is a deficient number, since it is larger than the sum of its proper divisors (274710093).

665756499 is a wasteful number, since it uses less digits than its factorization.

665756499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8006.

The product of its digits is 12247200, while the sum is 57.

The square root of 665756499 is about 25802.2576337808. The cubic root of 665756499 is about 873.1827313327.

The spelling of 665756499 in words is "six hundred sixty-five million, seven hundred fifty-six thousand, four hundred ninety-nine".