13540443977 has 2 divisors, whose sum is σ = 13540443978. Its totient is φ = 13540443976.

The previous prime is 13540443967. The next prime is 13540444061. The reversal of 13540443977 is 77934404531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12710082121 + 830361856 = 112739^2 + 28816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13540443977 is a prime.

It is not a weakly prime, because it can be changed into another prime (13540443907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6770221988 + 6770221989.

It is an arithmetic number, because the mean of its divisors is an integer number (6770221989).

Almost surely, 2^13540443977 is an apocalyptic number.

It is an amenable number.

13540443977 is a deficient number, since it is larger than the sum of its proper divisors (1).

13540443977 is an equidigital number, since it uses as much as digits as its factorization.

13540443977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 13540443977 in words is "thirteen billion, five hundred forty million, four hundred forty-three thousand, nine hundred seventy-seven".