1661160065100 has 72 divisors (see below), whose sum is σ = 4812088204560. Its totient is φ = 442441601280.

The previous prime is 1661160065077. The next prime is 1661160065113. The reversal of 1661160065100 is 15600611661.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3090987 + ... + 3588386.

Almost surely, 2^{1661160065100} is an apocalyptic number.

1661160065100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661160065100 is an abundant number, since it is smaller than the sum of its proper divisors (3150928139460).

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

1661160065100 is a wasteful number, since it uses less digits than its factorization.

1661160065100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6680219 (or 6680212 counting only the distinct ones).

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

Adding to 1661160065100 its reverse (15600611661), we get a palindrome (1676760676761).

The spelling of 1661160065100 in words is "one trillion, six hundred sixty-one billion, one hundred sixty million, sixty-five thousand, one hundred".