1644242621662 has 16 divisors (see below), whose sum is σ = 2473734568032. Its totient is φ = 819666822240.

The previous prime is 1644242621653. The next prime is 1644242621683. The reversal of 1644242621662 is 2661262424461.

It is a super-3 number, since 3×1644242621662³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781903 + ... + 1974805.

It is an arithmetic number, because the mean of its divisors is an integer number (154608410502).

Almost surely, 2^{1644242621662} is an apocalyptic number.

1644242621662 is a deficient number, since it is larger than the sum of its proper divisors (829491946370).

1644242621662 is a wasteful number, since it uses less digits than its factorization.

1644242621662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194963.

The product of its digits is 1327104, while the sum is 46.

The spelling of 1644242621662 in words is "one trillion, six hundred forty-four billion, two hundred forty-two million, six hundred twenty-one thousand, six hundred sixty-two".