65775949 has 2 divisors, whose sum is σ = 65775950. Its totient is φ = 65775948.

The previous prime is 65775911. The next prime is 65775959. The reversal of 65775949 is 94957756.

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., 36421225 + 29354724 = 6035^2 + 5418^2 .

It is a cyclic number.

It is not a de Polignac number, because 65775949 - 2⁷ = 65775821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65775896 and 65775905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65775959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32887974 + 32887975.

It is an arithmetic number, because the mean of its divisors is an integer number (32887975).

Almost surely, 2^65775949 is an apocalyptic number.

It is an amenable number.

65775949 is a deficient number, since it is larger than the sum of its proper divisors (1).

65775949 is an equidigital number, since it uses as much as digits as its factorization.

65775949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 52.

The square root of 65775949 is about 8110.2372961585. The cubic root of 65775949 is about 403.6661887398. Note that the first 3 decimals are identical.

The spelling of 65775949 in words is "sixty-five million, seven hundred seventy-five thousand, nine hundred forty-nine".