657121163 has 2 divisors, whose sum is σ = 657121164. Its totient is φ = 657121162.

The previous prime is 657121123. The next prime is 657121169. The reversal of 657121163 is 361121756.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657121163 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (657121169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328560581 + 328560582.

It is an arithmetic number, because the mean of its divisors is an integer number (328560582).

Almost surely, 2^657121163 is an apocalyptic number.

657121163 is a deficient number, since it is larger than the sum of its proper divisors (1).

657121163 is an equidigital number, since it uses as much as digits as its factorization.

657121163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 657121163 is about 25634.3746364135. The cubic root of 657121163 is about 869.3910227237.

The spelling of 657121163 in words is "six hundred fifty-seven million, one hundred twenty-one thousand, one hundred sixty-three".