64519420071 has 16 divisors (see below), whose sum is σ = 91237731840. Its totient is φ = 40468343520.

The previous prime is 64519420057. The next prime is 64519420079. The reversal of 64519420071 is 17002491546.

It is not a de Polignac number, because 64519420071 - 2²³ = 64511031463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64519420079) 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 in 15 ways as a sum of consecutive naturals, for example, 7660251 + ... + 7668668.

It is an arithmetic number, because the mean of its divisors is an integer number (5702358240).

Almost surely, 2^64519420071 is an apocalyptic number.

64519420071 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

64519420071 is a deficient number, since it is larger than the sum of its proper divisors (26718311769).

64519420071 is a wasteful number, since it uses less digits than its factorization.

64519420071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15329006.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 64519420071 in words is "sixty-four billion, five hundred nineteen million, four hundred twenty thousand, seventy-one".