64381956877 has 4 divisors (see below), whose sum is σ = 73579379296. Its totient is φ = 55184534460.

The previous prime is 64381956853. The next prime is 64381956887. The reversal of 64381956877 is 77865918346.

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 64381956877 - 2¹¹ = 64381954829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64381956887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4598711199 + ... + 4598711212.

It is an arithmetic number, because the mean of its divisors is an integer number (18394844824).

Almost surely, 2^64381956877 is an apocalyptic number.

It is an amenable number.

64381956877 is a deficient number, since it is larger than the sum of its proper divisors (9197422419).

64381956877 is an equidigital number, since it uses as much as digits as its factorization.

64381956877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9197422418.

The product of its digits is 60963840, while the sum is 64.

The spelling of 64381956877 in words is "sixty-four billion, three hundred eighty-one million, nine hundred fifty-six thousand, eight hundred seventy-seven".