9661517925 has 12 divisors (see below), whose sum is σ = 15973709760. Its totient is φ = 5152809520.

The previous prime is 9661517891. The next prime is 9661517927. The reversal of 9661517925 is 5297151669.

It is not a de Polignac number, because 9661517925 - 2¹⁶ = 9661452389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661517927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64410045 + ... + 64410194.

It is an arithmetic number, because the mean of its divisors is an integer number (1331142480).

Almost surely, 2^9661517925 is an apocalyptic number.

It is an amenable number.

9661517925 is a deficient number, since it is larger than the sum of its proper divisors (6312191835).

9661517925 is a wasteful number, since it uses less digits than its factorization.

9661517925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128820252 (or 128820247 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 51.

The square root of 9661517925 is about 98293.0207339260. The cubic root of 9661517925 is about 2129.8472360629.

The spelling of 9661517925 in words is "nine billion, six hundred sixty-one million, five hundred seventeen thousand, nine hundred twenty-five".