64139855893147 has 4 divisors (see below), whose sum is σ = 67515637782280. Its totient is φ = 60764074004016.

The previous prime is 64139855893067. The next prime is 64139855893163. The reversal of 64139855893147 is 74139855893146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64139855893147 is a prime.

It is a super-2 number, since 2×64139855893147² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64139855893147.

It is not an unprimeable number, because it can be changed into a prime (64139855893187) 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, 1687890944538 + ... + 1687890944575.

It is an arithmetic number, because the mean of its divisors is an integer number (16878909445570).

Almost surely, 2^{64139855893147} is an apocalyptic number.

64139855893147 is a deficient number, since it is larger than the sum of its proper divisors (3375781889133).

64139855893147 is a wasteful number, since it uses less digits than its factorization.

64139855893147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375781889132.

The product of its digits is 783820800, while the sum is 73.

Subtracting 64139855893147 from its reverse (74139855893146), we obtain a palindrome (9999999999999).

The spelling of 64139855893147 in words is "sixty-four trillion, one hundred thirty-nine billion, eight hundred fifty-five million, eight hundred ninety-three thousand, one hundred forty-seven".