64918187719 has 16 divisors (see below), whose sum is σ = 81057288960. Its totient is φ = 50510396160.

The previous prime is 64918187717. The next prime is 64918187729. The reversal of 64918187719 is 91778181946.

It is not a de Polignac number, because 64918187719 - 2¹ = 64918187717 is a prime.

It is a super-2 number, since 2×64918187719² (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 (64918187717) 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 15 ways as a sum of consecutive naturals, for example, 574549 + ... + 678190.

It is an arithmetic number, because the mean of its divisors is an integer number (5066080560).

Almost surely, 2^64918187719 is an apocalyptic number.

64918187719 is a deficient number, since it is larger than the sum of its proper divisors (16139101241).

64918187719 is a wasteful number, since it uses less digits than its factorization.

64918187719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253430.

The product of its digits is 6096384, while the sum is 61.

The spelling of 64918187719 in words is "sixty-four billion, nine hundred eighteen million, one hundred eighty-seven thousand, seven hundred nineteen".