71020075897 has 4 divisors (see below), whose sum is σ = 71047175076. Its totient is φ = 70992976720.

The previous prime is 71020075817. The next prime is 71020075943. The reversal of 71020075897 is 79857002017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57343007296 + 13677068601 = 239464^2 + 116949^2 .

It is a cyclic number.

It is not a de Polignac number, because 71020075897 - 2¹⁹ = 71019551609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71020075817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13545658 + ... + 13550899.

It is an arithmetic number, because the mean of its divisors is an integer number (17761793769).

Almost surely, 2^71020075897 is an apocalyptic number.

It is an amenable number.

71020075897 is a deficient number, since it is larger than the sum of its proper divisors (27099179).

71020075897 is a wasteful number, since it uses less digits than its factorization.

71020075897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27099178.

The product of its (nonzero) digits is 246960, while the sum is 46.

The spelling of 71020075897 in words is "seventy-one billion, twenty million, seventy-five thousand, eight hundred ninety-seven".