66511581752768 has 28 divisors (see below), whose sum is σ = 132351563317680. Its totient is φ = 33163156349952.

The previous prime is 66511581752741. The next prime is 66511581752773. The reversal of 66511581752768 is 86725718511566.

It is a super-4 number, since 4×66511581752768⁴ (a number of 56 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66511581752698 and 66511581752707.

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, 1447391321 + ... + 1447437272.

It is an arithmetic number, because the mean of its divisors is an integer number (4726841547060).

Almost surely, 2^{66511581752768} is an apocalyptic number.

It is an amenable number.

66511581752768 is a deficient number, since it is larger than the sum of its proper divisors (65839981564912).

66511581752768 is a wasteful number, since it uses less digits than its factorization.

66511581752768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894828964 (or 2894828954 counting only the distinct ones).

The product of its digits is 169344000, while the sum is 68.

The spelling of 66511581752768 in words is "sixty-six trillion, five hundred eleven billion, five hundred eighty-one million, seven hundred fifty-two thousand, seven hundred sixty-eight".