43485906557 has 2 divisors, whose sum is σ = 43485906558. Its totient is φ = 43485906556.

The previous prime is 43485906523. The next prime is 43485906571. The reversal of 43485906557 is 75560958434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42482980996 + 1002925561 = 206114^2 + 31669^2 .

It is a cyclic number.

It is not a de Polignac number, because 43485906557 - 2¹² = 43485902461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43485906577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21742953278 + 21742953279.

It is an arithmetic number, because the mean of its divisors is an integer number (21742953279).

Almost surely, 2^43485906557 is an apocalyptic number.

It is an amenable number.

43485906557 is a deficient number, since it is larger than the sum of its proper divisors (1).

43485906557 is an equidigital number, since it uses as much as digits as its factorization.

43485906557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 43485906557 in words is "forty-three billion, four hundred eighty-five million, nine hundred six thousand, five hundred fifty-seven".