64645601155 has 16 divisors (see below), whose sum is σ = 78132729600. Its totient is φ = 51344808832.

The previous prime is 64645601129. The next prime is 64645601177. The reversal of 64645601155 is 55110654646.

It is a cyclic number.

It is not a de Polignac number, because 64645601155 - 2¹⁷ = 64645470083 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 1624557 + ... + 1663873.

It is an arithmetic number, because the mean of its divisors is an integer number (4883295600).

Almost surely, 2^64645601155 is an apocalyptic number.

64645601155 is a deficient number, since it is larger than the sum of its proper divisors (13487128445).

64645601155 is a wasteful number, since it uses less digits than its factorization.

64645601155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41678.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 64645601155 in words is "sixty-four billion, six hundred forty-five million, six hundred one thousand, one hundred fifty-five".