1643791117437 has 24 divisors (see below), whose sum is σ = 2831540809344. Its totient is φ = 898469678304.

The previous prime is 1643791117351. The next prime is 1643791117457. The reversal of 1643791117437 is 7347111973461.

1643791117437 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 7 + 91 + 117 + 437 = 666.

It is not a de Polignac number, because 1643791117437 - 2¹⁵ = 1643791084669 is a prime.

It is a super-2 number, since 2×1643791117437² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643791117457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 567214258 + ... + 567217155.

It is an arithmetic number, because the mean of its divisors is an integer number (117980867056).

Almost surely, 2^{1643791117437} is an apocalyptic number.

It is an amenable number.

1643791117437 is a deficient number, since it is larger than the sum of its proper divisors (1187749691907).

1643791117437 is a wasteful number, since it uses less digits than its factorization.

1643791117437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134431449 (or 1134431446 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The spelling of 1643791117437 in words is "one trillion, six hundred forty-three billion, seven hundred ninety-one million, one hundred seventeen thousand, four hundred thirty-seven".