9957625661 has 4 divisors (see below), whose sum is σ = 10278839424. Its totient is φ = 9636411900.

The previous prime is 9957625609. The next prime is 9957625739. The reversal of 9957625661 is 1665267599.

9957625661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9957625661 - 2¹⁰ = 9957624637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9957625597 and 9957625606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9957625361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160606835 + ... + 160606896.

It is an arithmetic number, because the mean of its divisors is an integer number (2569709856).

Almost surely, 2^9957625661 is an apocalyptic number.

It is an amenable number.

9957625661 is a deficient number, since it is larger than the sum of its proper divisors (321213763).

9957625661 is a wasteful number, since it uses less digits than its factorization.

9957625661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321213762.

The product of its digits is 6123600, while the sum is 56.

The square root of 9957625661 is about 99787.9033801192. The cubic root of 9957625661 is about 2151.3872900544.

The spelling of 9957625661 in words is "nine billion, nine hundred fifty-seven million, six hundred twenty-five thousand, six hundred sixty-one".