667256652767 has 4 divisors (see below), whose sum is σ = 667301202000. Its totient is φ = 667212103536.

The previous prime is 667256652761. The next prime is 667256652827. The reversal of 667256652767 is 767256652766.

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

It is a cyclic number.

It is not a de Polignac number, because 667256652767 - 2¹² = 667256648671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667256652761) 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, 22252142 + ... + 22282107.

It is an arithmetic number, because the mean of its divisors is an integer number (166825300500).

Almost surely, 2^667256652767 is an apocalyptic number.

667256652767 is a deficient number, since it is larger than the sum of its proper divisors (44549233).

667256652767 is a wasteful number, since it uses less digits than its factorization.

667256652767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44549232.

The product of its digits is 266716800, while the sum is 65.

Subtracting 667256652767 from its reverse (767256652766), we obtain a palindrome (99999999999).

The spelling of 667256652767 in words is "six hundred sixty-seven billion, two hundred fifty-six million, six hundred fifty-two thousand, seven hundred sixty-seven".