9725707161 has 27 divisors (see below), whose sum is σ = 14279734677. Its totient is φ = 6378676920.

The previous prime is 9725707073. The next prime is 9725707163. The reversal of 9725707161 is 1617075279.

The square root of 9725707161 is 98619.

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

9725707161 is a `hidden beast` number, since 9 + 7 + 2 + 570 + 71 + 6 + 1 = 666.

It is not a de Polignac number, because 9725707161 - 2¹⁵ = 9725674393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9725707163) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21005616 + ... + 21006078.

Almost surely, 2^9725707161 is an apocalyptic number.

9725707161 is the 98619-th square number.

9725707161 is the 49310-th centered octagonal number.

It is an amenable number.

9725707161 is a deficient number, since it is larger than the sum of its proper divisors (4554027516).

9725707161 is an frugal number, since it uses more digits than its factorization.

9725707161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 185220, while the sum is 45.

The cubic root of 9725707161 is about 2134.5535915623.

The spelling of 9725707161 in words is "nine billion, seven hundred twenty-five million, seven hundred seven thousand, one hundred sixty-one".