71109278057 has 2 divisors, whose sum is σ = 71109278058. Its totient is φ = 71109278056.

The previous prime is 71109278041. The next prime is 71109278137. The reversal of 71109278057 is 75087290117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60140695696 + 10968582361 = 245236^2 + 104731^2 .

It is a cyclic number.

It is not a de Polignac number, because 71109278057 - 2⁴ = 71109278041 is a prime.

It is not a weakly prime, because it can be changed into another prime (71109278557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35554639028 + 35554639029.

It is an arithmetic number, because the mean of its divisors is an integer number (35554639029).

Almost surely, 2^71109278057 is an apocalyptic number.

It is an amenable number.

71109278057 is a deficient number, since it is larger than the sum of its proper divisors (1).

71109278057 is an equidigital number, since it uses as much as digits as its factorization.

71109278057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 47.

The spelling of 71109278057 in words is "seventy-one billion, one hundred nine million, two hundred seventy-eight thousand, fifty-seven".