1001561165660 has 48 divisors (see below), whose sum is σ = 2294634781152. Its totient is φ = 364180377600.

The previous prime is 1001561165603. The next prime is 1001561165687. The reversal of 1001561165660 is 665611651001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3440180 + ... + 3719940.

It is an arithmetic number, because the mean of its divisors is an integer number (47804891274).

Almost surely, 2^{1001561165660} is an apocalyptic number.

1001561165660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001561165660 is an abundant number, since it is smaller than the sum of its proper divisors (1293073615492).

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

1001561165660 is a wasteful number, since it uses less digits than its factorization.

1001561165660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296054 (or 296052 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 1001561165660 in words is "one trillion, one billion, five hundred sixty-one million, one hundred sixty-five thousand, six hundred sixty".