1406661335666 has 16 divisors (see below), whose sum is σ = 2114023788504. Its totient is φ = 701987556864.

The previous prime is 1406661335663. The next prime is 1406661335687. The reversal of 1406661335666 is 6665331666041.

It can be written as a sum of positive squares in 4 ways, for example, as 1087283767441 + 319377568225 = 1042729^2 + 565135^2 .

It is a super-2 number, since 2×1406661335666² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1406661335663) 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 7 ways as a sum of consecutive naturals, for example, 3267356 + ... + 3672728.

Almost surely, 2^{1406661335666} is an apocalyptic number.

1406661335666 is a deficient number, since it is larger than the sum of its proper divisors (707362452838).

1406661335666 is a wasteful number, since it uses less digits than its factorization.

1406661335666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408685.

The product of its (nonzero) digits is 8398080, while the sum is 53.

The spelling of 1406661335666 in words is "one trillion, four hundred six billion, six hundred sixty-one million, three hundred thirty-five thousand, six hundred sixty-six".