65815651619 has 2 divisors, whose sum is σ = 65815651620. Its totient is φ = 65815651618.

The previous prime is 65815651547. The next prime is 65815651651. The reversal of 65815651619 is 91615651856.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65815651619 - 2²⁴ = 65798874403 is a prime.

It is a super-2 number, since 2×65815651619² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65815650619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32907825809 + 32907825810.

It is an arithmetic number, because the mean of its divisors is an integer number (32907825810).

Almost surely, 2^65815651619 is an apocalyptic number.

65815651619 is a deficient number, since it is larger than the sum of its proper divisors (1).

65815651619 is an equidigital number, since it uses as much as digits as its factorization.

65815651619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944000, while the sum is 53.

The spelling of 65815651619 in words is "sixty-five billion, eight hundred fifteen million, six hundred fifty-one thousand, six hundred nineteen".