667216216525 has 48 divisors (see below), whose sum is σ = 881545809600. Its totient is φ = 499521116160.

The previous prime is 667216216523. The next prime is 667216216559. The reversal of 667216216525 is 525612612766.

It is not a de Polignac number, because 667216216525 - 2¹ = 667216216523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667216216523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17922631 + ... + 17959819.

It is an arithmetic number, because the mean of its divisors is an integer number (18365537700).

Almost surely, 2^667216216525 is an apocalyptic number.

It is an amenable number.

667216216525 is a deficient number, since it is larger than the sum of its proper divisors (214329593075).

667216216525 is a wasteful number, since it uses less digits than its factorization.

667216216525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37678 (or 37673 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 49.

The spelling of 667216216525 in words is "six hundred sixty-seven billion, two hundred sixteen million, two hundred sixteen thousand, five hundred twenty-five".