64375505687539 has 4 divisors (see below), whose sum is σ = 67174440717456. Its totient is φ = 61576570657624.

The previous prime is 64375505687513. The next prime is 64375505687567. The reversal of 64375505687539 is 93578650557346.

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

It is a cyclic number.

It is not a de Polignac number, because 64375505687539 - 2¹⁵ = 64375505654771 is a prime.

It is a super-2 number, since 2×64375505687539² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64375505687239) 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, 1399467514924 + ... + 1399467514969.

It is an arithmetic number, because the mean of its divisors is an integer number (16793610179364).

Almost surely, 2^{64375505687539} is an apocalyptic number.

64375505687539 is a deficient number, since it is larger than the sum of its proper divisors (2798935029917).

64375505687539 is a wasteful number, since it uses less digits than its factorization.

64375505687539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798935029916.

The product of its (nonzero) digits is 2857680000, while the sum is 73.

The spelling of 64375505687539 in words is "sixty-four trillion, three hundred seventy-five billion, five hundred five million, six hundred eighty-seven thousand, five hundred thirty-nine".