64716609487 has 4 divisors (see below), whose sum is σ = 64719734400. Its totient is φ = 64713484576.

The previous prime is 64716609473. The next prime is 64716609497. The reversal of 64716609487 is 78490661746.

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 64716609487 - 2¹⁹ = 64716085199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64716609407) 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, 1531183 + ... + 1572880.

It is an arithmetic number, because the mean of its divisors is an integer number (16179933600).

Almost surely, 2^64716609487 is an apocalyptic number.

64716609487 is a deficient number, since it is larger than the sum of its proper divisors (3124913).

64716609487 is a wasteful number, since it uses less digits than its factorization.

64716609487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124912.

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 64716609487 in words is "sixty-four billion, seven hundred sixteen million, six hundred nine thousand, four hundred eighty-seven".