65406637 has 2 divisors, whose sum is σ = 65406638. Its totient is φ = 65406636.

The previous prime is 65406631. The next prime is 65406659. The reversal of 65406637 is 73660456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49294441 + 16112196 = 7021^2 + 4014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65406637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65406596 and 65406605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65406631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32703318 + 32703319.

It is an arithmetic number, because the mean of its divisors is an integer number (32703319).

Almost surely, 2^65406637 is an apocalyptic number.

It is an amenable number.

65406637 is a deficient number, since it is larger than the sum of its proper divisors (1).

65406637 is an equidigital number, since it uses as much as digits as its factorization.

65406637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 65406637 is about 8087.4369858442. The cubic root of 65406637 is about 402.9092826365.

The spelling of 65406637 in words is "sixty-five million, four hundred six thousand, six hundred thirty-seven".