9971804457 has 20 divisors (see below), whose sum is σ = 14922963396. Its totient is φ = 6635904480.

The previous prime is 9971804449. The next prime is 9971804471. The reversal of 9971804457 is 7544081799.

9971804457 is a `hidden beast` number, since 9 + 9 + 7 + 180 + 4 + 457 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6238472256 + 3733332201 = 78984^2 + 61101^2 .

It is not a de Polignac number, because 9971804457 - 2³ = 9971804449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9971804497) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 65394 + ... + 155627.

Almost surely, 2^9971804457 is an apocalyptic number.

It is an amenable number.

9971804457 is a deficient number, since it is larger than the sum of its proper divisors (4951158939).

9971804457 is a wasteful number, since it uses less digits than its factorization.

9971804457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221590 (or 221581 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The square root of 9971804457 is about 99858.9227710774. The cubic root of 9971804457 is about 2152.4079354570.

The spelling of 9971804457 in words is "nine billion, nine hundred seventy-one million, eight hundred four thousand, four hundred fifty-seven".