65570720491 has 2 divisors, whose sum is σ = 65570720492. Its totient is φ = 65570720490.

The previous prime is 65570720489. The next prime is 65570720521. The reversal of 65570720491 is 19402707556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65570720491 - 2¹ = 65570720489 is a prime.

Together with 65570720489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (65570720591) 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, 32785360245 + 32785360246.

It is an arithmetic number, because the mean of its divisors is an integer number (32785360246).

Almost surely, 2^65570720491 is an apocalyptic number.

65570720491 is a deficient number, since it is larger than the sum of its proper divisors (1).

65570720491 is an equidigital number, since it uses as much as digits as its factorization.

65570720491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 65570720491 in words is "sixty-five billion, five hundred seventy million, seven hundred twenty thousand, four hundred ninety-one".