64909857205 has 16 divisors (see below), whose sum is σ = 80376194304. Its totient is φ = 50284946880.

The previous prime is 64909857197. The next prime is 64909857247. The reversal of 64909857205 is 50275890946.

It is not a de Polignac number, because 64909857205 - 2³ = 64909857197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792397 + ... + 870466.

It is an arithmetic number, because the mean of its divisors is an integer number (5023512144).

Almost surely, 2^64909857205 is an apocalyptic number.

It is an amenable number.

64909857205 is a deficient number, since it is larger than the sum of its proper divisors (15466337099).

64909857205 is a wasteful number, since it uses less digits than its factorization.

64909857205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663116.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 64909857205 in words is "sixty-four billion, nine hundred nine million, eight hundred fifty-seven thousand, two hundred five".