64278303423664 has 80 divisors (see below), whose sum is σ = 137413717459200. Its totient is φ = 28884450804480.

The previous prime is 64278303423641. The next prime is 64278303423673. The reversal of 64278303423664 is 46632430387246.

It is a junction number, because it is equal to n+sod(n) for n = 64278303423599 and 64278303423608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7620862 + ... + 13661410.

It is an arithmetic number, because the mean of its divisors is an integer number (1717671468240).

Almost surely, 2^{64278303423664} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64278303423664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68706858729600).

64278303423664 is an abundant number, since it is smaller than the sum of its proper divisors (73135414035536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64278303423664 is a wasteful number, since it uses less digits than its factorization.

64278303423664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6041258 (or 6041252 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 58.

The spelling of 64278303423664 in words is "sixty-four trillion, two hundred seventy-eight billion, three hundred three million, four hundred twenty-three thousand, six hundred sixty-four".