66057281307516 has 12 divisors (see below), whose sum is σ = 154133656384232. Its totient is φ = 22019093769168.

The previous prime is 66057281307497. The next prime is 66057281307557. The reversal of 66057281307516 is 61570318275066.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×66057281307516³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2752386721135 + ... + 2752386721158.

Almost surely, 2^{66057281307516} is an apocalyptic number.

It is an amenable number.

66057281307516 is an abundant number, since it is smaller than the sum of its proper divisors (88076375076716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66057281307516 is a wasteful number, since it uses less digits than its factorization.

66057281307516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504773442300 (or 5504773442298 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 57.

The spelling of 66057281307516 in words is "sixty-six trillion, fifty-seven billion, two hundred eighty-one million, three hundred seven thousand, five hundred sixteen".