66161011600500 has 96 divisors (see below), whose sum is σ = 195099611266560. Its totient is φ = 17419608086400.

The previous prime is 66161011600487. The next prime is 66161011600511. The reversal of 66161011600500 is 500611016166.

It is a congruent number.

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, 279041887 + ... + 279278886.

It is an arithmetic number, because the mean of its divisors is an integer number (2032287617360).

Almost surely, 2^{66161011600500} is an apocalyptic number.

66161011600500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66161011600500 is an abundant number, since it is smaller than the sum of its proper divisors (128938599666060).

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

66161011600500 is a wasteful number, since it uses less digits than its factorization.

66161011600500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558320874 (or 558320862 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

Adding to 66161011600500 its reverse (500611016166), we get a palindrome (66661622616666).

The spelling of 66161011600500 in words is "sixty-six trillion, one hundred sixty-one billion, eleven million, six hundred thousand, five hundred".