667606750527631 has 4 divisors (see below), whose sum is σ = 668070688507200. Its totient is φ = 667142812548064.

The previous prime is 667606750527593. The next prime is 667606750527641. The reversal of 667606750527631 is 136725057606766.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667606750527631 is a prime.

It is a super-2 number, since 2×667606750527631² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667606750527641) 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, 231968987626 + ... + 231968990503.

It is an arithmetic number, because the mean of its divisors is an integer number (167017672126800).

Almost surely, 2^{667606750527631} is an apocalyptic number.

667606750527631 is a deficient number, since it is larger than the sum of its proper divisors (463937979569).

667606750527631 is a wasteful number, since it uses less digits than its factorization.

667606750527631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463937979568.

The product of its (nonzero) digits is 400075200, while the sum is 67.

The spelling of 667606750527631 in words is "six hundred sixty-seven trillion, six hundred six billion, seven hundred fifty million, five hundred twenty-seven thousand, six hundred thirty-one".