6564139955 has 8 divisors (see below), whose sum is σ = 7879159104. Its totient is φ = 5249851200.

The previous prime is 6564139891. The next prime is 6564139961. The reversal of 6564139955 is 5599314656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6564139955 - 2⁶ = 6564139891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6564139897 and 6564139906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162626 + ... + 198935.

It is an arithmetic number, because the mean of its divisors is an integer number (984894888).

Almost surely, 2^6564139955 is an apocalyptic number.

6564139955 is a deficient number, since it is larger than the sum of its proper divisors (1315019149).

6564139955 is a wasteful number, since it uses less digits than its factorization.

6564139955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365197.

The product of its digits is 4374000, while the sum is 53.

The square root of 6564139955 is about 81019.3801198207. The cubic root of 6564139955 is about 1872.3740382754.

The spelling of 6564139955 in words is "six billion, five hundred sixty-four million, one hundred thirty-nine thousand, nine hundred fifty-five".