42668577449 has 2 divisors, whose sum is σ = 42668577450. Its totient is φ = 42668577448.

The previous prime is 42668577433. The next prime is 42668577461. The reversal of 42668577449 is 94477586624.

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., 23105520025 + 19563057424 = 152005^2 + 139868^2 .

It is a cyclic number.

It is not a de Polignac number, because 42668577449 - 2⁴ = 42668577433 is a prime.

It is a super-2 number, since 2×42668577449² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42668577391 and 42668577400.

It is not a weakly prime, because it can be changed into another prime (42668577499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21334288724 + 21334288725.

It is an arithmetic number, because the mean of its divisors is an integer number (21334288725).

Almost surely, 2^42668577449 is an apocalyptic number.

It is an amenable number.

42668577449 is a deficient number, since it is larger than the sum of its proper divisors (1).

42668577449 is an equidigital number, since it uses as much as digits as its factorization.

42668577449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 62.

The spelling of 42668577449 in words is "forty-two billion, six hundred sixty-eight million, five hundred seventy-seven thousand, four hundred forty-nine".