65651639 has 2 divisors, whose sum is σ = 65651640. Its totient is φ = 65651638.

The previous prime is 65651617. The next prime is 65651657. The reversal of 65651639 is 93615656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65651639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65651596 and 65651605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65651659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32825819 + 32825820.

It is an arithmetic number, because the mean of its divisors is an integer number (32825820).

Almost surely, 2^65651639 is an apocalyptic number.

65651639 is a deficient number, since it is larger than the sum of its proper divisors (1).

65651639 is an equidigital number, since it uses as much as digits as its factorization.

65651639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 41.

The square root of 65651639 is about 8102.5699009635. The cubic root of 65651639 is about 403.4117320603.

The spelling of 65651639 in words is "sixty-five million, six hundred fifty-one thousand, six hundred thirty-nine".