43620433206557 has 2 divisors, whose sum is σ = 43620433206558. Its totient is φ = 43620433206556.

The previous prime is 43620433206533. The next prime is 43620433206587. The reversal of 43620433206557 is 75560233402634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43494829593721 + 125603612836 = 6595061^2 + 354406^2 .

It is a cyclic number.

It is not a de Polignac number, because 43620433206557 - 2³⁴ = 43603253337373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43620433206587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21810216603278 + 21810216603279.

It is an arithmetic number, because the mean of its divisors is an integer number (21810216603279).

Almost surely, 2^{43620433206557} is an apocalyptic number.

It is an amenable number.

43620433206557 is a deficient number, since it is larger than the sum of its proper divisors (1).

43620433206557 is an equidigital number, since it uses as much as digits as its factorization.

43620433206557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10886400, while the sum is 50.

The spelling of 43620433206557 in words is "forty-three trillion, six hundred twenty billion, four hundred thirty-three million, two hundred six thousand, five hundred fifty-seven".