43557777049 has 2 divisors, whose sum is σ = 43557777050. Its totient is φ = 43557777048.

The previous prime is 43557777023. The next prime is 43557777061. The reversal of 43557777049 is 94077775534.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41371560000 + 2186217049 = 203400^2 + 46757^2 .

It is a cyclic number.

It is not a de Polignac number, because 43557777049 - 2⁷ = 43557776921 is a prime.

It is a super-2 number, since 2×43557777049² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43557776984 and 43557777002.

It is not a weakly prime, because it can be changed into another prime (43557777079) 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 as a sum of consecutive naturals, namely, 21778888524 + 21778888525.

It is an arithmetic number, because the mean of its divisors is an integer number (21778888525).

Almost surely, 2^43557777049 is an apocalyptic number.

It is an amenable number.

43557777049 is a deficient number, since it is larger than the sum of its proper divisors (1).

43557777049 is an equidigital number, since it uses as much as digits as its factorization.

43557777049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25930800, while the sum is 58.

The spelling of 43557777049 in words is "forty-three billion, five hundred fifty-seven million, seven hundred seventy-seven thousand, forty-nine".