1661123112060 has 48 divisors (see below), whose sum is σ = 4652200375200. Its totient is φ = 442865624064.

The previous prime is 1661123112049. The next prime is 1661123112067. The reversal of 1661123112060 is 602113211661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661123112067) 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 15 ways as a sum of consecutive naturals, for example, 2875105 + ... + 3404184.

It is an arithmetic number, because the mean of its divisors is an integer number (96920841150).

Almost surely, 2^{1661123112060} is an apocalyptic number.

1661123112060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661123112060 is an abundant number, since it is smaller than the sum of its proper divisors (2991077263140).

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

1661123112060 is a wasteful number, since it uses less digits than its factorization.

1661123112060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6283710 (or 6283708 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 1661123112060 in words is "one trillion, six hundred sixty-one billion, one hundred twenty-three million, one hundred twelve thousand, sixty".