1405640666244 has 48 divisors (see below), whose sum is σ = 3293294070528. Its totient is φ = 466625779488.

The previous prime is 1405640666197. The next prime is 1405640666251. The reversal of 1405640666244 is 4426660465041.

It is a junction number, because it is equal to n+sod(n) for n = 1405640666193 and 1405640666202.

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, 4212187 + ... + 4533629.

It is an arithmetic number, because the mean of its divisors is an integer number (68610293136).

Almost surely, 2^{1405640666244} is an apocalyptic number.

It is an amenable number.

1405640666244 is an abundant number, since it is smaller than the sum of its proper divisors (1887653404284).

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

1405640666244 is a wasteful number, since it uses less digits than its factorization.

1405640666244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322944 (or 322942 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 48.

The spelling of 1405640666244 in words is "one trillion, four hundred five billion, six hundred forty million, six hundred sixty-six thousand, two hundred forty-four".