667256652707 has 4 divisors (see below), whose sum is σ = 667798698336. Its totient is φ = 666714607080.

The previous prime is 667256652691. The next prime is 667256652731. The reversal of 667256652707 is 707256652766.

667256652707 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, and also an emirpimes, since its reverse is a distinct semiprime: 707256652766 = 2 ⋅353628326383.

It is a cyclic number.

It is not a de Polignac number, because 667256652707 - 2⁴ = 667256652691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667256652107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271020968 + ... + 271023429.

It is an arithmetic number, because the mean of its divisors is an integer number (166949674584).

Almost surely, 2^667256652707 is an apocalyptic number.

667256652707 is a deficient number, since it is larger than the sum of its proper divisors (542045629).

667256652707 is a wasteful number, since it uses less digits than its factorization.

667256652707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542045628.

The product of its (nonzero) digits is 44452800, while the sum is 59.

Adding to 667256652707 its sum of digits (59), we get a palindrome (667256652766).

The spelling of 667256652707 in words is "six hundred sixty-seven billion, two hundred fifty-six million, six hundred fifty-two thousand, seven hundred seven".