657145549 has 2 divisors, whose sum is σ = 657145550. Its totient is φ = 657145548.

The previous prime is 657145519. The next prime is 657145553. The reversal of 657145549 is 945541756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365077449 + 292068100 = 19107^2 + 17090^2 .

It is a cyclic number.

It is not a de Polignac number, because 657145549 - 2¹³ = 657137357 is a prime.

It is a super-2 number, since 2×657145549² = 863680545141022802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 657145499 and 657145508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (657145519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328572774 + 328572775.

It is an arithmetic number, because the mean of its divisors is an integer number (328572775).

Almost surely, 2^657145549 is an apocalyptic number.

It is an amenable number.

657145549 is a deficient number, since it is larger than the sum of its proper divisors (1).

657145549 is an equidigital number, since it uses as much as digits as its factorization.

657145549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756000, while the sum is 46.

The square root of 657145549 is about 25634.8502823793. The cubic root of 657145549 is about 869.4017770606.

The spelling of 657145549 in words is "six hundred fifty-seven million, one hundred forty-five thousand, five hundred forty-nine".