64506036389 has 4 divisors (see below), whose sum is σ = 64617832524. Its totient is φ = 64394240256.

The previous prime is 64506036341. The next prime is 64506036403. The reversal of 64506036389 is 98363060546.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61734856225 + 2771180164 = 248465^2 + 52642^2 .

It is a cyclic number.

It is not a de Polignac number, because 64506036389 - 2¹² = 64506032293 is a prime.

It is a super-2 number, since 2×64506036389² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64506036289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55897202 + ... + 55898355.

It is an arithmetic number, because the mean of its divisors is an integer number (16154458131).

Almost surely, 2^64506036389 is an apocalyptic number.

It is an amenable number.

64506036389 is a deficient number, since it is larger than the sum of its proper divisors (111796135).

64506036389 is a wasteful number, since it uses less digits than its factorization.

64506036389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111796134.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 64506036389 in words is "sixty-four billion, five hundred six million, thirty-six thousand, three hundred eighty-nine".