64911547505 has 16 divisors (see below), whose sum is σ = 89224354560. Its totient is φ = 44409373632.

The previous prime is 64911547499. The next prime is 64911547507. The reversal of 64911547505 is 50574511946.

It is a cyclic number.

It is not a de Polignac number, because 64911547505 - 2¹⁶ = 64911481969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64911547505.

It is not an unprimeable number, because it can be changed into a prime (64911547507) 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 15 ways as a sum of consecutive naturals, for example, 2096954 + ... + 2127683.

It is an arithmetic number, because the mean of its divisors is an integer number (5576522160).

Almost surely, 2^64911547505 is an apocalyptic number.

It is an amenable number.

64911547505 is a deficient number, since it is larger than the sum of its proper divisors (24312807055).

64911547505 is a wasteful number, since it uses less digits than its factorization.

64911547505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4225088.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 64911547505 in words is "sixty-four billion, nine hundred eleven million, five hundred forty-seven thousand, five hundred five".