64524157009 has 4 divisors (see below), whose sum is σ = 69487553716. Its totient is φ = 59560760304.

The previous prime is 64524156979. The next prime is 64524157037. The reversal of 64524157009 is 90075142546.

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 10272430609 + 54251726400 = 101353^2 + 232920^2 .

It is a cyclic number.

It is not a de Polignac number, because 64524157009 - 2⁷ = 64524156881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64524157109) 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, 2481698334 + ... + 2481698359.

It is an arithmetic number, because the mean of its divisors is an integer number (17371888429).

Almost surely, 2^64524157009 is an apocalyptic number.

It is an amenable number.

64524157009 is a deficient number, since it is larger than the sum of its proper divisors (4963396707).

64524157009 is a wasteful number, since it uses less digits than its factorization.

64524157009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963396706.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 64524157009 in words is "sixty-four billion, five hundred twenty-four million, one hundred fifty-seven thousand, nine".