667237237648 has 20 divisors (see below), whose sum is σ = 1294788973068. Its totient is φ = 333098147840.

The previous prime is 667237237633. The next prime is 667237237697. The reversal of 667237237648 is 846732732766.

It can be written as a sum of positive squares in 2 ways, for example, as 317000528784 + 350236708864 = 563028^2 + 591808^2 .

It is a super-4 number, since 4×667237237648⁴ (a number of 48 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32518861 + ... + 32539372.

Almost surely, 2^667237237648 is an apocalyptic number.

It is an amenable number.

667237237648 is a deficient number, since it is larger than the sum of its proper divisors (627551735420).

667237237648 is a wasteful number, since it uses less digits than its factorization.

667237237648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65058882 (or 65058876 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 61.

The spelling of 667237237648 in words is "six hundred sixty-seven billion, two hundred thirty-seven million, two hundred thirty-seven thousand, six hundred forty-eight".