1661655050000 has 240 divisors, whose sum is σ = 4541306212800. Its totient is φ = 583396800000.

The previous prime is 1661655049973. The next prime is 1661655050009. The reversal of 1661655050000 is 505561661.

It is a super-2 number, since 2×1661655050000² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661655050009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15897911 + ... + 16002089.

It is an arithmetic number, because the mean of its divisors is an integer number (18922109220).

Almost surely, 2^{1661655050000} is an apocalyptic number.

1661655050000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661655050000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270653106400).

1661655050000 is an abundant number, since it is smaller than the sum of its proper divisors (2879651162800).

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

1661655050000 is a wasteful number, since it uses less digits than its factorization.

1661655050000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104252 (or 104226 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 1661655050000 in words is "one trillion, six hundred sixty-one billion, six hundred fifty-five million, fifty thousand".