65678969 has 2 divisors, whose sum is σ = 65678970. Its totient is φ = 65678968.

The previous prime is 65678957. The next prime is 65678983. The reversal of 65678969 is 96987656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 473344 = 8075^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 65678969 - 2¹⁶ = 65613433 is a prime.

It is a super-2 number, since 2×65678969² = 8627453937805922, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (65675969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32839484 + 32839485.

It is an arithmetic number, because the mean of its divisors is an integer number (32839485).

Almost surely, 2^65678969 is an apocalyptic number.

It is an amenable number.

65678969 is a deficient number, since it is larger than the sum of its proper divisors (1).

65678969 is an equidigital number, since it uses as much as digits as its factorization.

65678969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 56.

The square root of 65678969 is about 8104.2562274400. The cubic root of 65678969 is about 403.4677028036.

The spelling of 65678969 in words is "sixty-five million, six hundred seventy-eight thousand, nine hundred sixty-nine".