161049551680900 has 81 divisors (see below), whose sum is σ = 350104598735493. Its totient is φ = 64304438373600.

The previous prime is 161049551680877. The next prime is 161049551680909. The reversal of 161049551680900 is 9086155940161.

It is a happy number.

The square root of 161049551680900 is 12690530.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 57977838605124 + 103071713075776 = 7614318^2 + 10152424^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161049551680909) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 124747909255 + ... + 124747910545.

Almost surely, 2^{161049551680900} is an apocalyptic number.

161049551680900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161049551680900 is the 12690530-th square number.

It is an amenable number.

161049551680900 is an abundant number, since it is smaller than the sum of its proper divisors (189055047054593).

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

161049551680900 is an frugal number, since it uses more digits than its factorization.

161049551680900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4562 (or 2281 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 161049551680900 in words is "one hundred sixty-one trillion, forty-nine billion, five hundred fifty-one million, six hundred eighty thousand, nine hundred".