66737473765 has 8 divisors (see below), whose sum is σ = 80669531160. Its totient is φ = 53000270592.

The previous prime is 66737473753. The next prime is 66737473849. The reversal of 66737473765 is 56737473766.

It can be written as a sum of positive squares in 4 ways, for example, as 7642780929 + 59094692836 = 87423^2 + 243094^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66737473765 - 2¹⁵ = 66737440997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48712800 + ... + 48714169.

It is an arithmetic number, because the mean of its divisors is an integer number (10083691395).

Almost surely, 2^66737473765 is an apocalyptic number.

It is an amenable number.

66737473765 is a deficient number, since it is larger than the sum of its proper divisors (13932057395).

66737473765 is a wasteful number, since it uses less digits than its factorization.

66737473765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97427111.

The product of its digits is 93350880, while the sum is 61.

Subtracting from 66737473765 its reverse (56737473766), we obtain a palindrome (9999999999).

The spelling of 66737473765 in words is "sixty-six billion, seven hundred thirty-seven million, four hundred seventy-three thousand, seven hundred sixty-five".