43781485577 has 2 divisors, whose sum is σ = 43781485578. Its totient is φ = 43781485576.

The previous prime is 43781485499. The next prime is 43781485607. The reversal of 43781485577 is 77558418734.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38571388816 + 5210096761 = 196396^2 + 72181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43781485577 is a prime.

It is not a weakly prime, because it can be changed into another prime (43781485277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21890742788 + 21890742789.

It is an arithmetic number, because the mean of its divisors is an integer number (21890742789).

Almost surely, 2^43781485577 is an apocalyptic number.

It is an amenable number.

43781485577 is a deficient number, since it is larger than the sum of its proper divisors (1).

43781485577 is an equidigital number, since it uses as much as digits as its factorization.

43781485577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26342400, while the sum is 59.

The spelling of 43781485577 in words is "forty-three billion, seven hundred eighty-one million, four hundred eighty-five thousand, five hundred seventy-seven".