64416727919 has 4 divisors (see below), whose sum is σ = 67807082040. Its totient is φ = 61026373800.

The previous prime is 64416727909. The next prime is 64416727943. The reversal of 64416727919 is 91972761446.

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

It is a cyclic number.

It is not a de Polignac number, because 64416727919 - 2²⁸ = 64148292463 is a prime.

It is a super-2 number, since 2×64416727919² (a number of 22 digits) contains 22 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 (64416727909) 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, 1695177032 + ... + 1695177069.

It is an arithmetic number, because the mean of its divisors is an integer number (16951770510).

Almost surely, 2^64416727919 is an apocalyptic number.

64416727919 is a deficient number, since it is larger than the sum of its proper divisors (3390354121).

64416727919 is a wasteful number, since it uses less digits than its factorization.

64416727919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390354120.

The product of its digits is 4572288, while the sum is 56.

The spelling of 64416727919 in words is "sixty-four billion, four hundred sixteen million, seven hundred twenty-seven thousand, nine hundred nineteen".