9657421957 has 8 divisors (see below), whose sum is σ = 9894350592. Its totient is φ = 9420559200.

The previous prime is 9657421933. The next prime is 9657421967. The reversal of 9657421957 is 7591247569.

It is a happy number.

9657421957 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9657421957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9657421898 and 9657421907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9657421927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420588 + ... + 442954.

It is an arithmetic number, because the mean of its divisors is an integer number (1236793824).

Almost surely, 2^9657421957 is an apocalyptic number.

It is an amenable number.

9657421957 is a deficient number, since it is larger than the sum of its proper divisors (236928635).

9657421957 is a wasteful number, since it uses less digits than its factorization.

9657421957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32939.

The product of its digits is 4762800, while the sum is 55.

The square root of 9657421957 is about 98272.1830275485. The cubic root of 9657421957 is about 2129.5462129977.

The spelling of 9657421957 in words is "nine billion, six hundred fifty-seven million, four hundred twenty-one thousand, nine hundred fifty-seven".