64221303394 has 4 divisors (see below), whose sum is σ = 96331955094. Its totient is φ = 32110651696.

The previous prime is 64221303371. The next prime is 64221303397. The reversal of 64221303394 is 49330312246.

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

It can be written as a sum of positive squares in only one way, i.e., 47993855625 + 16227447769 = 219075^2 + 127387^2 .

It is not an unprimeable number, because it can be changed into a prime (64221303397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16055325847 + ... + 16055325850.

Almost surely, 2^64221303394 is an apocalyptic number.

64221303394 is a deficient number, since it is larger than the sum of its proper divisors (32110651700).

64221303394 is a wasteful number, since it uses less digits than its factorization.

64221303394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32110651699.

The product of its (nonzero) digits is 93312, while the sum is 37.

The spelling of 64221303394 in words is "sixty-four billion, two hundred twenty-one million, three hundred three thousand, three hundred ninety-four".