71550721485 has 24 divisors (see below), whose sum is σ = 125249191704. Its totient is φ = 37782556800.

The previous prime is 71550721483. The next prime is 71550721547. The reversal of 71550721485 is 58412705517.

71550721485 is a `hidden beast` number, since 7 + 1 + 550 + 7 + 2 + 14 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 28629655209 + 42921066276 = 169203^2 + 207174^2 .

It is not a de Polignac number, because 71550721485 - 2¹ = 71550721483 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71550721485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71550721483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7866822 + ... + 7875911.

It is an arithmetic number, because the mean of its divisors is an integer number (5218716321).

Almost surely, 2^71550721485 is an apocalyptic number.

It is an amenable number.

71550721485 is a deficient number, since it is larger than the sum of its proper divisors (53698470219).

71550721485 is a wasteful number, since it uses less digits than its factorization.

71550721485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15742845 (or 15742842 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 45.

The spelling of 71550721485 in words is "seventy-one billion, five hundred fifty million, seven hundred twenty-one thousand, four hundred eighty-five".