9725640897 has 16 divisors (see below), whose sum is σ = 14848486272. Its totient is φ = 5546835840.

The previous prime is 9725640893. The next prime is 9725640901. The reversal of 9725640897 is 7980465279.

9725640897 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9725640893) and next prime (9725640901).

It is not a de Polignac number, because 9725640897 - 2² = 9725640893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9725640893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433518 + ... + 455399.

It is an arithmetic number, because the mean of its divisors is an integer number (928030392).

Almost surely, 2^9725640897 is an apocalyptic number.

It is an amenable number.

9725640897 is a deficient number, since it is larger than the sum of its proper divisors (5122845375).

9725640897 is a wasteful number, since it uses less digits than its factorization.

9725640897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889448.

The product of its (nonzero) digits is 7620480, while the sum is 57.

The square root of 9725640897 is about 98618.6640398256. The cubic root of 9725640897 is about 2134.5487437784.

The spelling of 9725640897 in words is "nine billion, seven hundred twenty-five million, six hundred forty thousand, eight hundred ninety-seven".