64871645871 has 4 divisors (see below), whose sum is σ = 86495527832. Its totient is φ = 43247763912.

The previous prime is 64871645837. The next prime is 64871645893. The reversal of 64871645871 is 17854617846.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64871645871 - 2⁶ = 64871645807 is a prime.

It is a super-3 number, since 3×64871645871³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64871640871) 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, 10811940976 + ... + 10811940981.

It is an arithmetic number, because the mean of its divisors is an integer number (21623881958).

Almost surely, 2^64871645871 is an apocalyptic number.

64871645871 is a deficient number, since it is larger than the sum of its proper divisors (21623881961).

64871645871 is a wasteful number, since it uses less digits than its factorization.

64871645871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21623881960.

The product of its digits is 9031680, while the sum is 57.

The spelling of 64871645871 in words is "sixty-four billion, eight hundred seventy-one million, six hundred forty-five thousand, eight hundred seventy-one".