66740437542239 has 4 divisors (see below), whose sum is σ = 66741530687424. Its totient is φ = 66739344397056.

The previous prime is 66740437542221. The next prime is 66740437542271. The reversal of 66740437542239 is 93224573404766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66740437542239 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 (66740437542439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546481007 + ... + 546603120.

It is an arithmetic number, because the mean of its divisors is an integer number (16685382671856).

Almost surely, 2^{66740437542239} is an apocalyptic number.

66740437542239 is a deficient number, since it is larger than the sum of its proper divisors (1093145185).

66740437542239 is a wasteful number, since it uses less digits than its factorization.

66740437542239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093145184.

The product of its (nonzero) digits is 182891520, while the sum is 62.

The spelling of 66740437542239 in words is "sixty-six trillion, seven hundred forty billion, four hundred thirty-seven million, five hundred forty-two thousand, two hundred thirty-nine".