43437694057 has 2 divisors, whose sum is σ = 43437694058. Its totient is φ = 43437694056.

The previous prime is 43437694043. The next prime is 43437694061. The reversal of 43437694057 is 75049673434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33522314281 + 9915379776 = 183091^2 + 99576^2 .

It is a cyclic number.

It is not a de Polignac number, because 43437694057 - 2²³ = 43429305449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43437693995 and 43437694013.

It is not a weakly prime, because it can be changed into another prime (43437694957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21718847028 + 21718847029.

It is an arithmetic number, because the mean of its divisors is an integer number (21718847029).

Almost surely, 2^43437694057 is an apocalyptic number.

It is an amenable number.

43437694057 is a deficient number, since it is larger than the sum of its proper divisors (1).

43437694057 is an equidigital number, since it uses as much as digits as its factorization.

43437694057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 52.

The spelling of 43437694057 in words is "forty-three billion, four hundred thirty-seven million, six hundred ninety-four thousand, fifty-seven".