669632809699 has 4 divisors (see below), whose sum is σ = 765294639664. Its totient is φ = 573970979736.

The previous prime is 669632809697. The next prime is 669632809717. The reversal of 669632809699 is 996908236966.

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

It is not a de Polignac number, because 669632809699 - 2¹ = 669632809697 is a prime.

It is a super-3 number, since 3×669632809699³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669632809697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47830914972 + ... + 47830914985.

It is an arithmetic number, because the mean of its divisors is an integer number (191323659916).

Almost surely, 2^669632809699 is an apocalyptic number.

669632809699 is a deficient number, since it is larger than the sum of its proper divisors (95661829965).

669632809699 is an equidigital number, since it uses as much as digits as its factorization.

669632809699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95661829964.

The product of its (nonzero) digits is 408146688, while the sum is 73.

The spelling of 669632809699 in words is "six hundred sixty-nine billion, six hundred thirty-two million, eight hundred nine thousand, six hundred ninety-nine".