65424221604 has 108 divisors (see below), whose sum is σ = 192887931600. Its totient is φ = 18643123296.

The previous prime is 65424221593. The next prime is 65424221623. The reversal of 65424221604 is 40612242456.

65424221604 is a `hidden beast` number, since 6 + 5 + 4 + 2 + 42 + 2 + 1 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 619627 + ... + 717485.

Almost surely, 2^65424221604 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 65424221604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96443965800).

65424221604 is an abundant number, since it is smaller than the sum of its proper divisors (127463709996).

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

65424221604 is a wasteful number, since it uses less digits than its factorization.

65424221604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98262 (or 98250 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 65424221604 in words is "sixty-five billion, four hundred twenty-four million, two hundred twenty-one thousand, six hundred four".