1043655565940 has 24 divisors (see below), whose sum is σ = 2360267203560. Its totient is φ = 385349747328.

The previous prime is 1043655565933. The next prime is 1043655565969. The reversal of 1043655565940 is 495655563401.

It can be written as a sum of positive squares in 4 ways, for example, as 63563485924 + 980092080016 = 252118^2 + 989996^2 .

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, 2007029675 + ... + 2007030194.

It is an arithmetic number, because the mean of its divisors is an integer number (98344466815).

Almost surely, 2^{1043655565940} is an apocalyptic number.

1043655565940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1043655565940 is an abundant number, since it is smaller than the sum of its proper divisors (1316611637620).

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

1043655565940 is a wasteful number, since it uses less digits than its factorization.

1043655565940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014059891 (or 4014059889 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 1043655565940 in words is "one trillion, forty-three billion, six hundred fifty-five million, five hundred sixty-five thousand, nine hundred forty".