43661036786240 has 28 divisors (see below), whose sum is σ = 103967843847996. Its totient is φ = 17464414714368.

The previous prime is 43661036786207. The next prime is 43661036786243. The reversal of 43661036786240 is 4268763016634.

It can be written as a sum of positive squares in 2 ways, for example, as 31232986467904 + 12428050318336 = 5588648^2 + 3525344^2 .

It is a super-2 number, since 2×43661036786240² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43661036786243) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 68220369659 + ... + 68220370298.

Almost surely, 2^{43661036786240} is an apocalyptic number.

43661036786240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43661036786240 is an abundant number, since it is smaller than the sum of its proper divisors (60306807061756).

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

43661036786240 is a wasteful number, since it uses less digits than its factorization.

43661036786240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136440739974 (or 136440739964 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 56.

The spelling of 43661036786240 in words is "forty-three trillion, six hundred sixty-one billion, thirty-six million, seven hundred eighty-six thousand, two hundred forty".