66747073747 has 4 divisors (see below), whose sum is σ = 68299331320. Its totient is φ = 65194816176.

The previous prime is 66747073733. The next prime is 66747073843. The reversal of 66747073747 is 74737074766.

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

It is a cyclic number.

It is not a de Polignac number, because 66747073747 - 2¹⁵ = 66747040979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66747073691 and 66747073700.

It is not an unprimeable number, because it can be changed into a prime (66747073247) 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, 776128722 + ... + 776128807.

It is an arithmetic number, because the mean of its divisors is an integer number (17074832830).

Almost surely, 2^66747073747 is an apocalyptic number.

66747073747 is a deficient number, since it is larger than the sum of its proper divisors (1552257573).

66747073747 is a wasteful number, since it uses less digits than its factorization.

66747073747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552257572.

The product of its (nonzero) digits is 29042496, while the sum is 58.

The spelling of 66747073747 in words is "sixty-six billion, seven hundred forty-seven million, seventy-three thousand, seven hundred forty-seven".