64655405 has 4 divisors (see below), whose sum is σ = 77586492. Its totient is φ = 51724320.

The previous prime is 64655399. The next prime is 64655411. The reversal of 64655405 is 50455646.

64655405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50455646 = 2 ⋅25227823.

It is an interprime number because it is at equal distance from previous prime (64655399) and next prime (64655411).

It can be written as a sum of positive squares in 2 ways, for example, as 50495236 + 14160169 = 7106^2 + 3763^2 .

It is not a de Polignac number, because 64655405 - 2²⁴ = 47878189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6465536 + ... + 6465545.

It is an arithmetic number, because the mean of its divisors is an integer number (19396623).

Almost surely, 2^64655405 is an apocalyptic number.

It is an amenable number.

64655405 is a deficient number, since it is larger than the sum of its proper divisors (12931087).

64655405 is a wasteful number, since it uses less digits than its factorization.

64655405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12931086.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 64655405 is about 8040.8584740685. The cubic root of 64655405 is about 401.3607924434.

The spelling of 64655405 in words is "sixty-four million, six hundred fifty-five thousand, four hundred five".