43604240121557 has 2 divisors, whose sum is σ = 43604240121558. Its totient is φ = 43604240121556.

The previous prime is 43604240121499. The next prime is 43604240121599. The reversal of 43604240121557 is 75512104240634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39083177735716 + 4521062385841 = 6251654^2 + 2126279^2 .

It is a cyclic number.

It is not a de Polignac number, because 43604240121557 - 2¹⁰ = 43604240120533 is a prime.

It is a super-2 number, since 2×43604240121557² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43604240121257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21802120060778 + 21802120060779.

It is an arithmetic number, because the mean of its divisors is an integer number (21802120060779).

Almost surely, 2^{43604240121557} is an apocalyptic number.

It is an amenable number.

43604240121557 is a deficient number, since it is larger than the sum of its proper divisors (1).

43604240121557 is an equidigital number, since it uses as much as digits as its factorization.

43604240121557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 43604240121557 in words is "forty-three trillion, six hundred four billion, two hundred forty million, one hundred twenty-one thousand, five hundred fifty-seven".