64520040479 has 2 divisors, whose sum is σ = 64520040480. Its totient is φ = 64520040478.

The previous prime is 64520040461. The next prime is 64520040569. The reversal of 64520040479 is 97404002546.

64520040479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64520040479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64520040679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32260020239 + 32260020240.

It is an arithmetic number, because the mean of its divisors is an integer number (32260020240).

Almost surely, 2^64520040479 is an apocalyptic number.

64520040479 is a deficient number, since it is larger than the sum of its proper divisors (1).

64520040479 is an equidigital number, since it uses as much as digits as its factorization.

64520040479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 64520040479 in words is "sixty-four billion, five hundred twenty million, forty thousand, four hundred seventy-nine".