66746073601 has 4 divisors (see below), whose sum is σ = 66746694100. Its totient is φ = 66745453104.

The previous prime is 66746073599. The next prime is 66746073631. The reversal of 66746073601 is 10637064766.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 47819192976 + 18926880625 = 218676^2 + 137575^2 .

It is a cyclic number.

It is not a de Polignac number, because 66746073601 - 2¹ = 66746073599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66746073631) 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, 102546 + ... + 379483.

It is an arithmetic number, because the mean of its divisors is an integer number (16686673525).

Almost surely, 2^66746073601 is an apocalyptic number.

It is an amenable number.

66746073601 is a deficient number, since it is larger than the sum of its proper divisors (620499).

66746073601 is a wasteful number, since it uses less digits than its factorization.

66746073601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620498.

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

The spelling of 66746073601 in words is "sixty-six billion, seven hundred forty-six million, seventy-three thousand, six hundred one".