43999554502661 has 2 divisors, whose sum is σ = 43999554502662. Its totient is φ = 43999554502660.

The previous prime is 43999554502627. The next prime is 43999554502733. The reversal of 43999554502661 is 16620545599934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27183773005636 + 16815781497025 = 5213806^2 + 4100705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43999554502661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43999554502591 and 43999554502600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43999554502361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21999777251330 + 21999777251331.

It is an arithmetic number, because the mean of its divisors is an integer number (21999777251331).

Almost surely, 2^{43999554502661} is an apocalyptic number.

It is an amenable number.

43999554502661 is a deficient number, since it is larger than the sum of its proper divisors (1).

43999554502661 is an equidigital number, since it uses as much as digits as its factorization.

43999554502661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928000, while the sum is 68.

The spelling of 43999554502661 in words is "forty-three trillion, nine hundred ninety-nine billion, five hundred fifty-four million, five hundred two thousand, six hundred sixty-one".