64856431441 has 4 divisors (see below), whose sum is σ = 65285944384. Its totient is φ = 64426918500.

The previous prime is 64856431399. The next prime is 64856431447. The reversal of 64856431441 is 14413465846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64856431441 - 2²¹ = 64854334289 is a prime.

It is a super-2 number, since 2×64856431441² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64856431391 and 64856431400.

It is not an unprimeable number, because it can be changed into a prime (64856431447) 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, 214756245 + ... + 214756546.

It is an arithmetic number, because the mean of its divisors is an integer number (16321486096).

Almost surely, 2^64856431441 is an apocalyptic number.

It is an amenable number.

64856431441 is a deficient number, since it is larger than the sum of its proper divisors (429512943).

64856431441 is a wasteful number, since it uses less digits than its factorization.

64856431441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429512942.

The product of its digits is 1105920, while the sum is 46.

The spelling of 64856431441 in words is "sixty-four billion, eight hundred fifty-six million, four hundred thirty-one thousand, four hundred forty-one".