64509396169 has 3 divisors (see below), whose sum is σ = 64509650157. Its totient is φ = 64509142182.

The previous prime is 64509396143. The next prime is 64509396179. The reversal of 64509396169 is 96169390546.

The square root of 64509396169 is 253987.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 64509396169 - 2¹⁷ = 64509265097 is a prime.

It is a super-2 number, since 2×64509396169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64509396109) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 126994 + ... + 380980.

It is an arithmetic number, because the mean of its divisors is an integer number (21503216719).

Almost surely, 2^64509396169 is an apocalyptic number.

64509396169 is the 253987-th square number.

64509396169 is the 126994-th centered octagonal number.

It is an amenable number.

64509396169 is a deficient number, since it is larger than the sum of its proper divisors (253988).

64509396169 is an frugal number, since it uses more digits than its factorization.

64509396169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507974 (or 253987 counting only the distinct ones).

The product of its (nonzero) digits is 9447840, while the sum is 58.

The spelling of 64509396169 in words is "sixty-four billion, five hundred nine million, three hundred ninety-six thousand, one hundred sixty-nine".