67643375437 has 4 divisors (see below), whose sum is σ = 73792773216. Its totient is φ = 61493977660.

The previous prime is 67643375431. The next prime is 67643375467. The reversal of 67643375437 is 73457334676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67643375437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67643375431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3074698873 + ... + 3074698894.

It is an arithmetic number, because the mean of its divisors is an integer number (18448193304).

Almost surely, 2^67643375437 is an apocalyptic number.

It is an amenable number.

67643375437 is a deficient number, since it is larger than the sum of its proper divisors (6149397779).

67643375437 is a wasteful number, since it uses less digits than its factorization.

67643375437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6149397778.

The product of its digits is 26671680, while the sum is 55.

The spelling of 67643375437 in words is "sixty-seven billion, six hundred forty-three million, three hundred seventy-five thousand, four hundred thirty-seven".