961645889425 has 24 divisors (see below), whose sum is σ = 1287369712440. Its totient is φ = 708367488000.

The previous prime is 961645889417. The next prime is 961645889459. The reversal of 961645889425 is 524988546169.

It can be written as a sum of positive squares in 12 ways, for example, as 341154119056 + 620491770369 = 584084^2 + 787713^2 .

It is not a de Polignac number, because 961645889425 - 2³ = 961645889417 is a prime.

It is a super-3 number, since 3×961645889425³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3559090 + ... + 3819739.

It is an arithmetic number, because the mean of its divisors is an integer number (53640404685).

Almost surely, 2^961645889425 is an apocalyptic number.

It is an amenable number.

961645889425 is a deficient number, since it is larger than the sum of its proper divisors (325723823015).

961645889425 is a wasteful number, since it uses less digits than its factorization.

961645889425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7379253 (or 7379248 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 67.

The spelling of 961645889425 in words is "nine hundred sixty-one billion, six hundred forty-five million, eight hundred eighty-nine thousand, four hundred twenty-five".