64520003291 has 4 divisors (see below), whose sum is σ = 64527401784. Its totient is φ = 64512604800.

The previous prime is 64520003263. The next prime is 64520003341. The reversal of 64520003291 is 19230002546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19230002546 = 2 ⋅9615001273.

It is a cyclic number.

It is not a de Polignac number, because 64520003291 - 2¹⁴ = 64519986907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64520003201) 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, 3686150 + ... + 3703611.

It is an arithmetic number, because the mean of its divisors is an integer number (16131850446).

Almost surely, 2^64520003291 is an apocalyptic number.

64520003291 is a deficient number, since it is larger than the sum of its proper divisors (7398493).

64520003291 is an equidigital number, since it uses as much as digits as its factorization.

64520003291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7398492.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 64520003291 in words is "sixty-four billion, five hundred twenty million, three thousand, two hundred ninety-one".