43123425557 has 2 divisors, whose sum is σ = 43123425558. Its totient is φ = 43123425556.

The previous prime is 43123425551. The next prime is 43123425599. The reversal of 43123425557 is 75552432134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41047165201 + 2076260356 = 202601^2 + 45566^2 .

It is a cyclic number.

It is not a de Polignac number, because 43123425557 - 2¹² = 43123421461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43123425551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21561712778 + 21561712779.

It is an arithmetic number, because the mean of its divisors is an integer number (21561712779).

Almost surely, 2^43123425557 is an apocalyptic number.

It is an amenable number.

43123425557 is a deficient number, since it is larger than the sum of its proper divisors (1).

43123425557 is an equidigital number, since it uses as much as digits as its factorization.

43123425557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 41.

The spelling of 43123425557 in words is "forty-three billion, one hundred twenty-three million, four hundred twenty-five thousand, five hundred fifty-seven".