657629849 has 2 divisors, whose sum is σ = 657629850. Its totient is φ = 657629848.

The previous prime is 657629813. The next prime is 657629879. The reversal of 657629849 is 948926756.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628003600 + 29626249 = 25060^2 + 5443^2 .

It is a cyclic number.

It is not a de Polignac number, because 657629849 - 2²⁴ = 640852633 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 657629794 and 657629803.

It is not a weakly prime, because it can be changed into another prime (657629879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328814924 + 328814925.

It is an arithmetic number, because the mean of its divisors is an integer number (328814925).

Almost surely, 2^657629849 is an apocalyptic number.

It is an amenable number.

657629849 is a deficient number, since it is larger than the sum of its proper divisors (1).

657629849 is an equidigital number, since it uses as much as digits as its factorization.

657629849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 56.

The square root of 657629849 is about 25644.2946676254. The cubic root of 657629849 is about 869.6153004771.

The spelling of 657629849 in words is "six hundred fifty-seven million, six hundred twenty-nine thousand, eight hundred forty-nine".