1661255622416 has 40 divisors (see below), whose sum is σ = 3473220408000. Its totient is φ = 765196776576.

The previous prime is 1661255622407. The next prime is 1661255622419. The reversal of 1661255622416 is 6142265521661.

It is not an unprimeable number, because it can be changed into a prime (1661255622419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7899020 + ... + 8106603.

It is an arithmetic number, because the mean of its divisors is an integer number (86830510200).

Almost surely, 2^{1661255622416} is an apocalyptic number.

1661255622416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1661255622416 is an abundant number, since it is smaller than the sum of its proper divisors (1811964785584).

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

1661255622416 is a wasteful number, since it uses less digits than its factorization.

1661255622416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16006143 (or 16006137 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The spelling of 1661255622416 in words is "one trillion, six hundred sixty-one billion, two hundred fifty-five million, six hundred twenty-two thousand, four hundred sixteen".