66641237137 has 4 divisors (see below), whose sum is σ = 68790954496. Its totient is φ = 64491519780.

The previous prime is 66641237123. The next prime is 66641237153. The reversal of 66641237137 is 73173214666.

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 not a de Polignac number, because 66641237137 - 2⁷ = 66641237009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66641237197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074858633 + ... + 1074858694.

It is an arithmetic number, because the mean of its divisors is an integer number (17197738624).

Almost surely, 2^66641237137 is an apocalyptic number.

It is an amenable number.

66641237137 is a deficient number, since it is larger than the sum of its proper divisors (2149717359).

66641237137 is a wasteful number, since it uses less digits than its factorization.

66641237137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149717358.

The product of its digits is 762048, while the sum is 46.

The spelling of 66641237137 in words is "sixty-six billion, six hundred forty-one million, two hundred thirty-seven thousand, one hundred thirty-seven".