65678477 has 2 divisors, whose sum is σ = 65678478. Its totient is φ = 65678476.

The previous prime is 65678471. The next prime is 65678513. The reversal of 65678477 is 77487656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38700841 + 26977636 = 6221^2 + 5194^2 .

It is a cyclic number.

It is not a de Polignac number, because 65678477 - 2⁴ = 65678461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65678471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32839238 + 32839239.

It is an arithmetic number, because the mean of its divisors is an integer number (32839239).

Almost surely, 2^65678477 is an apocalyptic number.

It is an amenable number.

65678477 is a deficient number, since it is larger than the sum of its proper divisors (1).

65678477 is an equidigital number, since it uses as much as digits as its factorization.

65678477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975680, while the sum is 50.

The square root of 65678477 is about 8104.2258729628. The cubic root of 65678477 is about 403.4666953446.

The spelling of 65678477 in words is "sixty-five million, six hundred seventy-eight thousand, four hundred seventy-seven".