475670916721 has 135 divisors (see below), whose sum is σ = 671555933223. Its totient is φ = 335685430080.

The previous prime is 475670916713. The next prime is 475670916727. The reversal of 475670916721 is 127619076574.

The square root of 475670916721 is 689689.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 450314813025 + 25356103696 = 671055^2 + 159236^2 .

It is not a de Polignac number, because 475670916721 - 2³ = 475670916713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (475670916727) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 8974922931 + ... + 8974922983.

Almost surely, 2^475670916721 is an apocalyptic number.

475670916721 is the 689689-th square number.

475670916721 is the 344845-th centered octagonal number.

It is an amenable number.

475670916721 is a deficient number, since it is larger than the sum of its proper divisors (195885016502).

475670916721 is an frugal number, since it uses more digits than its factorization.

475670916721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 475670916721 in words is "four hundred seventy-five billion, six hundred seventy million, nine hundred sixteen thousand, seven hundred twenty-one".