64542655 has 4 divisors (see below), whose sum is σ = 77451192. Its totient is φ = 51634120.

The previous prime is 64542649. The next prime is 64542679. The reversal of 64542655 is 55624546.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64542655 - 2⁹ = 64542143 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6454261 + ... + 6454270.

It is an arithmetic number, because the mean of its divisors is an integer number (19362798).

Almost surely, 2^64542655 is an apocalyptic number.

64542655 is a deficient number, since it is larger than the sum of its proper divisors (12908537).

64542655 is a wasteful number, since it uses less digits than its factorization.

64542655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12908536.

The product of its digits is 144000, while the sum is 37.

The square root of 64542655 is about 8033.8443475089. The cubic root of 64542655 is about 401.1273509646.

The spelling of 64542655 in words is "sixty-four million, five hundred forty-two thousand, six hundred fifty-five".