71045287605 has 72 divisors (see below), whose sum is σ = 131287393224. Its totient is φ = 35533209600.

The previous prime is 71045287591. The next prime is 71045287631. The reversal of 71045287605 is 50678254017.

71045287605 is a `hidden beast` number, since 7 + 10 + 4 + 5 + 28 + 7 + 605 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 3382352964 + 67662934641 = 58158^2 + 260121^2 .

It is not a de Polignac number, because 71045287605 - 2¹⁸ = 71045025461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3644685 + ... + 3664125.

It is an arithmetic number, because the mean of its divisors is an integer number (1823436017).

Almost surely, 2^71045287605 is an apocalyptic number.

It is an amenable number.

71045287605 is a deficient number, since it is larger than the sum of its proper divisors (60242105619).

71045287605 is a wasteful number, since it uses less digits than its factorization.

71045287605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19767 (or 19747 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 71045287605 in words is "seventy-one billion, forty-five million, two hundred eighty-seven thousand, six hundred five".