43277855681 has 2 divisors, whose sum is σ = 43277855682. Its totient is φ = 43277855680.

The previous prime is 43277855653. The next prime is 43277855693. The reversal of 43277855681 is 18655877234.

43277855681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35613728656 + 7664127025 = 188716^2 + 87545^2 .

It is a cyclic number.

It is not a de Polignac number, because 43277855681 - 2⁶ = 43277855617 is a prime.

It is a super-2 number, since 2×43277855681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43277855641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21638927840 + 21638927841.

It is an arithmetic number, because the mean of its divisors is an integer number (21638927841).

Almost surely, 2^43277855681 is an apocalyptic number.

It is an amenable number.

43277855681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43277855681 is an equidigital number, since it uses as much as digits as its factorization.

43277855681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11289600, while the sum is 56.

The spelling of 43277855681 in words is "forty-three billion, two hundred seventy-seven million, eight hundred fifty-five thousand, six hundred eighty-one".