1665222602406 has 32 divisors (see below), whose sum is σ = 3645047564928. Its totient is φ = 502969213440.

The previous prime is 1665222602377. The next prime is 1665222602411. The reversal of 1665222602406 is 6042062225661.

It is a super-2 number, since 2×1665222602406² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 41071995 + ... + 41112518.

It is an arithmetic number, because the mean of its divisors is an integer number (113907736404).

Almost surely, 2^{1665222602406} is an apocalyptic number.

1665222602406 is an abundant number, since it is smaller than the sum of its proper divisors (1979824962522).

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

1665222602406 is a wasteful number, since it uses less digits than its factorization.

1665222602406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82184836.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 1665222602406 in words is "one trillion, six hundred sixty-five billion, two hundred twenty-two million, six hundred two thousand, four hundred six".