64328207555 has 4 divisors (see below), whose sum is σ = 77193849072. Its totient is φ = 51462566040.

The previous prime is 64328207551. The next prime is 64328207557. The reversal of 64328207555 is 55570282346.

64328207555 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.

It is not a de Polignac number, because 64328207555 - 2² = 64328207551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64328207551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6432820751 + ... + 6432820760.

It is an arithmetic number, because the mean of its divisors is an integer number (19298462268).

Almost surely, 2^64328207555 is an apocalyptic number.

64328207555 is a deficient number, since it is larger than the sum of its proper divisors (12865641517).

64328207555 is a wasteful number, since it uses less digits than its factorization.

64328207555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12865641516.

The product of its (nonzero) digits is 2016000, while the sum is 47.

The spelling of 64328207555 in words is "sixty-four billion, three hundred twenty-eight million, two hundred seven thousand, five hundred fifty-five".