665222425464 has 64 divisors (see below), whose sum is σ = 1709474797440. Its totient is φ = 215561969280.

The previous prime is 665222425429. The next prime is 665222425481. The reversal of 665222425464 is 464524222566.

665222425464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 710679 + ... + 1354809.

It is an arithmetic number, because the mean of its divisors is an integer number (26710543710).

Almost surely, 2^665222425464 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 665222425464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (854737398720).

665222425464 is an abundant number, since it is smaller than the sum of its proper divisors (1044252371976).

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

665222425464 is a wasteful number, since it uses less digits than its factorization.

665222425464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645340 (or 645336 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 48.

The spelling of 665222425464 in words is "six hundred sixty-five billion, two hundred twenty-two million, four hundred twenty-five thousand, four hundred sixty-four".