665365563499 has 32 divisors (see below), whose sum is σ = 853403443200. Its totient is φ = 515242004256.

The previous prime is 665365563493. The next prime is 665365563517. The reversal of 665365563499 is 994365563566.

665365563499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665365563499 - 2³ = 665365563491 is a prime.

It is a super-2 number, since 2×665365563499² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665365563491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1377859 + ... + 1797004.

It is an arithmetic number, because the mean of its divisors is an integer number (26668857600).

Almost surely, 2^665365563499 is an apocalyptic number.

665365563499 is a deficient number, since it is larger than the sum of its proper divisors (188037879701).

665365563499 is a wasteful number, since it uses less digits than its factorization.

665365563499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174944 (or 3174930 counting only the distinct ones).

The product of its digits is 472392000, while the sum is 67.

Adding to 665365563499 its sum of digits (67), we get a palindrome (665365563566).

The spelling of 665365563499 in words is "six hundred sixty-five billion, three hundred sixty-five million, five hundred sixty-three thousand, four hundred ninety-nine".