64451389394 has 16 divisors (see below), whose sum is σ = 112299377856. Its totient is φ = 27169203600.

The previous prime is 64451389369. The next prime is 64451389421. The reversal of 64451389394 is 49398315446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37734152 + ... + 37735859.

It is an arithmetic number, because the mean of its divisors is an integer number (7018711116).

Almost surely, 2^64451389394 is an apocalyptic number.

64451389394 is a deficient number, since it is larger than the sum of its proper divisors (47847988462).

64451389394 is a wasteful number, since it uses less digits than its factorization.

64451389394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75470081.

The product of its digits is 11197440, while the sum is 56.

The spelling of 64451389394 in words is "sixty-four billion, four hundred fifty-one million, three hundred eighty-nine thousand, three hundred ninety-four".