65213415991 has 4 divisors (see below), whose sum is σ = 65221956072. Its totient is φ = 65204875912.

The previous prime is 65213415941. The next prime is 65213416001. The reversal of 65213415991 is 19951431256.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65213415991 - 2⁷ = 65213415863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65213415901) 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 in 3 ways as a sum of consecutive naturals, for example, 4258576 + ... + 4273861.

It is an arithmetic number, because the mean of its divisors is an integer number (16305489018).

Almost surely, 2^65213415991 is an apocalyptic number.

65213415991 is a deficient number, since it is larger than the sum of its proper divisors (8540081).

65213415991 is an equidigital number, since it uses as much as digits as its factorization.

65213415991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8540080.

The product of its digits is 291600, while the sum is 46.

The spelling of 65213415991 in words is "sixty-five billion, two hundred thirteen million, four hundred fifteen thousand, nine hundred ninety-one".