669515515966 has 32 divisors (see below), whose sum is σ = 1126007764992. Its totient is φ = 295953022560.

The previous prime is 669515515961. The next prime is 669515515967.

669515515966 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×669515515966³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 669515515898 and 669515515907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669515515961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1899766 + ... + 2224441.

It is an arithmetic number, because the mean of its divisors is an integer number (35187742656).

Almost surely, 2^669515515966 is an apocalyptic number.

669515515966 is a deficient number, since it is larger than the sum of its proper divisors (456492249026).

669515515966 is a wasteful number, since it uses less digits than its factorization.

669515515966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124424.

The product of its digits is 65610000, while the sum is 64.

The spelling of 669515515966 in words is "six hundred sixty-nine billion, five hundred fifteen million, five hundred fifteen thousand, nine hundred sixty-six".