669334686433965 has 12 divisors (see below), whose sum is σ = 1160180123152284. Its totient is φ = 356978499431424.

The previous prime is 669334686433961. The next prime is 669334686433969. The reversal of 669334686433965 is 569334686433966.

669334686433965 is a `hidden beast` number, since 6 + 6 + 9 + 3 + 3 + 46 + 86 + 433 + 9 + 65 = 666.

It is an interprime number because it is at equal distance from previous prime (669334686433961) and next prime (669334686433969).

It can be written as a sum of positive squares in 2 ways, for example, as 249412089641796 + 419922596792169 = 15792786^2 + 20492013^2 .

It is not a de Polignac number, because 669334686433965 - 2² = 669334686433961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669334686433961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7437052071444 + ... + 7437052071533.

It is an arithmetic number, because the mean of its divisors is an integer number (96681676929357).

Almost surely, 2^{669334686433965} is an apocalyptic number.

It is an amenable number.

669334686433965 is a deficient number, since it is larger than the sum of its proper divisors (490845436718319).

669334686433965 is a wasteful number, since it uses less digits than its factorization.

669334686433965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14874104142988 (or 14874104142985 counting only the distinct ones).

The product of its digits is 32651735040, while the sum is 81.

Subtracting from 669334686433965 its reverse (569334686433966), we obtain a palindrome (99999999999999).

The spelling of 669334686433965 in words is "six hundred sixty-nine trillion, three hundred thirty-four billion, six hundred eighty-six million, four hundred thirty-three thousand, nine hundred sixty-five".