669256652905 has 4 divisors (see below), whose sum is σ = 803107983492. Its totient is φ = 535405322320.

The previous prime is 669256652887. The next prime is 669256652923. The reversal of 669256652905 is 509256652966.

669256652905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (669256652887) and next prime (669256652923).

It can be written as a sum of positive squares in 2 ways, for example, as 102866449984 + 566390202921 = 320728^2 + 752589^2 .

It is not a de Polignac number, because 669256652905 - 2³¹ = 667109169257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66925665286 + ... + 66925665295.

It is an arithmetic number, because the mean of its divisors is an integer number (200776995873).

Almost surely, 2^669256652905 is an apocalyptic number.

It is an amenable number.

669256652905 is a deficient number, since it is larger than the sum of its proper divisors (133851330587).

669256652905 is a wasteful number, since it uses less digits than its factorization.

669256652905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133851330586.

The product of its (nonzero) digits is 52488000, while the sum is 61.

Adding to 669256652905 its sum of digits (61), we get a palindrome (669256652966).

The spelling of 669256652905 in words is "six hundred sixty-nine billion, two hundred fifty-six million, six hundred fifty-two thousand, nine hundred five".