64743617655 has 32 divisors (see below), whose sum is σ = 116006092800. Its totient is φ = 34258031136.

The previous prime is 64743617647. The next prime is 64743617657. The reversal of 64743617655 is 55671634746.

64743617655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64743617655 - 2³ = 64743617647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64743617657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1870975 + ... + 1905264.

It is an arithmetic number, because the mean of its divisors is an integer number (3625190400).

Almost surely, 2^64743617655 is an apocalyptic number.

64743617655 is a deficient number, since it is larger than the sum of its proper divisors (51262475145).

64743617655 is a wasteful number, since it uses less digits than its factorization.

64743617655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3776380 (or 3776374 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 54.

The spelling of 64743617655 in words is "sixty-four billion, seven hundred forty-three million, six hundred seventeen thousand, six hundred fifty-five".