66374731481 has 8 divisors (see below), whose sum is σ = 67577807880. Its totient is φ = 65179596672.

The previous prime is 66374731471. The next prime is 66374731513. The reversal of 66374731481 is 18413747366.

It can be written as a sum of positive squares in 4 ways, for example, as 12884293081 + 53490438400 = 113509^2 + 231280^2 .

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 66374731481 - 2³⁰ = 65300989657 is a prime.

It is a super-2 number, since 2×66374731481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66374731471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1968530 + ... + 2001963.

It is an arithmetic number, because the mean of its divisors is an integer number (8447225985).

Almost surely, 2^66374731481 is an apocalyptic number.

It is an amenable number.

66374731481 is a deficient number, since it is larger than the sum of its proper divisors (1203076399).

66374731481 is a wasteful number, since it uses less digits than its factorization.

66374731481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970795.

The product of its digits is 2032128, while the sum is 50.

The spelling of 66374731481 in words is "sixty-six billion, three hundred seventy-four million, seven hundred thirty-one thousand, four hundred eighty-one".