64636545794 has 4 divisors (see below), whose sum is σ = 96954818694. Its totient is φ = 32318272896.

The previous prime is 64636545793. The next prime is 64636545811. The reversal of 64636545794 is 49754563646.

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., 60645465169 + 3991080625 = 246263^2 + 63175^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64636545791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16159136447 + ... + 16159136450.

Almost surely, 2^64636545794 is an apocalyptic number.

64636545794 is a deficient number, since it is larger than the sum of its proper divisors (32318272900).

64636545794 is a wasteful number, since it uses less digits than its factorization.

64636545794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32318272899.

The product of its digits is 65318400, while the sum is 59.

The spelling of 64636545794 in words is "sixty-four billion, six hundred thirty-six million, five hundred forty-five thousand, seven hundred ninety-four".