64689366505 has 16 divisors (see below), whose sum is σ = 79156244304. Its totient is φ = 50733745920.

The previous prime is 64689366503. The next prime is 64689366517. The reversal of 64689366505 is 50566398646.

It can be written as a sum of positive squares in 8 ways, for example, as 1959655824 + 62729710681 = 44268^2 + 250459^2 .

It is not a de Polignac number, because 64689366505 - 2¹ = 64689366503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64689366505.

It is not an unprimeable number, because it can be changed into a prime (64689366503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229135 + ... + 426475.

It is an arithmetic number, because the mean of its divisors is an integer number (4947265269).

Almost surely, 2^64689366505 is an apocalyptic number.

It is an amenable number.

64689366505 is a deficient number, since it is larger than the sum of its proper divisors (14466877799).

64689366505 is a wasteful number, since it uses less digits than its factorization.

64689366505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198636.

The product of its (nonzero) digits is 27993600, while the sum is 58.

The spelling of 64689366505 in words is "sixty-four billion, six hundred eighty-nine million, three hundred sixty-six thousand, five hundred five".