64878520718 has 8 divisors (see below), whose sum is σ = 106164852120. Its totient is φ = 29490236680.

The previous prime is 64878520711. The next prime is 64878520739. The reversal of 64878520718 is 81702587846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64878520711) 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, 1474511813 + ... + 1474511856.

It is an arithmetic number, because the mean of its divisors is an integer number (13270606515).

Almost surely, 2^64878520718 is an apocalyptic number.

64878520718 is a deficient number, since it is larger than the sum of its proper divisors (41286331402).

64878520718 is a wasteful number, since it uses less digits than its factorization.

64878520718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949023682.

The product of its (nonzero) digits is 6021120, while the sum is 56.

The spelling of 64878520718 in words is "sixty-four billion, eight hundred seventy-eight million, five hundred twenty thousand, seven hundred eighteen".