65678537 has 2 divisors, whose sum is σ = 65678538. Its totient is φ = 65678536.

The previous prime is 65678513. The next prime is 65678539. The reversal of 65678537 is 73587656.

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., 65674816 + 3721 = 8104^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 65678537 - 2¹⁶ = 65613001 is a prime.

Together with 65678539, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 65678491 and 65678500.

It is not a weakly prime, because it can be changed into another prime (65678539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32839268 + 32839269.

It is an arithmetic number, because the mean of its divisors is an integer number (32839269).

Almost surely, 2^65678537 is an apocalyptic number.

It is an amenable number.

65678537 is a deficient number, since it is larger than the sum of its proper divisors (1).

65678537 is an equidigital number, since it uses as much as digits as its factorization.

65678537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 47.

The square root of 65678537 is about 8104.2295747344. The cubic root of 65678537 is about 403.4668182057.

The spelling of 65678537 in words is "sixty-five million, six hundred seventy-eight thousand, five hundred thirty-seven".