501666782811 has 8 divisors (see below), whose sum is σ = 668894257680. Its totient is φ = 334441914912.

The previous prime is 501666782741. The next prime is 501666782821. The reversal of 501666782811 is 118287666105.

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

It is not a de Polignac number, because 501666782811 - 2¹⁰ = 501666781787 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (501666782821) 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, 146856 + ... + 1012373.

It is an arithmetic number, because the mean of its divisors is an integer number (83611782210).

Almost surely, 2^501666782811 is an apocalyptic number.

501666782811 is a deficient number, since it is larger than the sum of its proper divisors (167227474869).

501666782811 is a wasteful number, since it uses less digits than its factorization.

501666782811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303485.

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 501666782811 in words is "five hundred one billion, six hundred sixty-six million, seven hundred eighty-two thousand, eight hundred eleven".