501111611660 has 96 divisors (see below), whose sum is σ = 1152839761920. Its totient is φ = 181455552000.

The previous prime is 501111611641. The next prime is 501111611687. The reversal of 501111611660 is 66116111105.

It is a happy number.

It is a super-2 number, since 2×501111611660² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86380760 + ... + 86386560.

It is an arithmetic number, because the mean of its divisors is an integer number (12008747520).

Almost surely, 2^501111611660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 501111611660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (576419880960).

501111611660 is an abundant number, since it is smaller than the sum of its proper divisors (651728150260).

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

501111611660 is a wasteful number, since it uses less digits than its factorization.

501111611660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7407 (or 7405 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 29.

Adding to 501111611660 its reverse (66116111105), we get a palindrome (567227722765).

The spelling of 501111611660 in words is "five hundred one billion, one hundred eleven million, six hundred eleven thousand, six hundred sixty".