667646832425 has 6 divisors (see below), whose sum is σ = 827882072238. Its totient is φ = 534117465920.

The previous prime is 667646832407. The next prime is 667646832451. The reversal of 667646832425 is 524238646766.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 171360397849 + 496286434576 = 413957^2 + 704476^2 .

It is not a de Polignac number, because 667646832425 - 2⁶ = 667646832361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13352936624 + ... + 13352936673.

It is an arithmetic number, because the mean of its divisors is an integer number (137980345373).

Almost surely, 2^667646832425 is an apocalyptic number.

It is an amenable number.

667646832425 is a deficient number, since it is larger than the sum of its proper divisors (160235239813).

667646832425 is a wasteful number, since it uses less digits than its factorization.

667646832425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26705873307 (or 26705873302 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 59.

The spelling of 667646832425 in words is "six hundred sixty-seven billion, six hundred forty-six million, eight hundred thirty-two thousand, four hundred twenty-five".