1591843509640 has 32 divisors (see below), whose sum is σ = 3640363441560. Its totient is φ = 626299084800.

The previous prime is 1591843509637. The next prime is 1591843509649. The reversal of 1591843509640 is 469053481951.

It can be written as a sum of positive squares in 4 ways, for example, as 1172512146276 + 419331363364 = 1082826^2 + 647558^2 .

It is not an unprimeable number, because it can be changed into a prime (1591843509649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326195001 + ... + 326199880.

Almost surely, 2^{1591843509640} is an apocalyptic number.

1591843509640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1591843509640 is an abundant number, since it is smaller than the sum of its proper divisors (2048519931920).

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

1591843509640 is a wasteful number, since it uses less digits than its factorization.

1591843509640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652394953 (or 652394949 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 1591843509640 in words is "one trillion, five hundred ninety-one billion, eight hundred forty-three million, five hundred nine thousand, six hundred forty".