64228718537 has 4 divisors (see below), whose sum is σ = 64599982980. Its totient is φ = 63857454096.

The previous prime is 64228718501. The next prime is 64228718539. The reversal of 64228718537 is 73581782246.

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 61287934096 + 2940784441 = 247564^2 + 54229^2 .

It is a cyclic number.

It is not a de Polignac number, because 64228718537 - 2¹⁰ = 64228717513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64228718539) 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, 185631962 + ... + 185632307.

It is an arithmetic number, because the mean of its divisors is an integer number (16149995745).

Almost surely, 2^64228718537 is an apocalyptic number.

It is an amenable number.

64228718537 is a deficient number, since it is larger than the sum of its proper divisors (371264443).

64228718537 is a wasteful number, since it uses less digits than its factorization.

64228718537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371264442.

The product of its digits is 4515840, while the sum is 53.

The spelling of 64228718537 in words is "sixty-four billion, two hundred twenty-eight million, seven hundred eighteen thousand, five hundred thirty-seven".