501111661171 has 16 divisors (see below), whose sum is σ = 552973817088. Its totient is φ = 450319079200.

The previous prime is 501111661109. The next prime is 501111661181. The reversal of 501111661171 is 171166111105.

It is a cyclic number.

It is not a de Polignac number, because 501111661171 - 2¹⁷ = 501111530099 is a prime.

It is a super-2 number, since 2×501111661171² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (501111661181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80826 + ... + 1004368.

It is an arithmetic number, because the mean of its divisors is an integer number (34560863568).

Almost surely, 2^501111661171 is an apocalyptic number.

501111661171 is a deficient number, since it is larger than the sum of its proper divisors (51862155917).

501111661171 is a wasteful number, since it uses less digits than its factorization.

501111661171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924122.

The product of its (nonzero) digits is 1260, while the sum is 31.

Adding to 501111661171 its reverse (171166111105), we get a palindrome (672277772276).

The spelling of 501111661171 in words is "five hundred one billion, one hundred eleven million, six hundred sixty-one thousand, one hundred seventy-one".