65221884450 has 90 divisors (see below), whose sum is σ = 181265383299. Its totient is φ = 17388168480.

The previous prime is 65221884439. The next prime is 65221884503. The reversal of 65221884450 is 5448812256.

65221884450 is a `hidden beast` number, since 6 + 5 + 22 + 188 + 445 + 0 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 47096378289 + 18125506161 = 217017^2 + 134631^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=180585.

It is a super-2 number, since 2×65221884450² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 65221884396 and 65221884405.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 16250644 + ... + 16254656.

Almost surely, 2^65221884450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65221884450

65221884450 is an abundant number, since it is smaller than the sum of its proper divisors (116043498849).

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

65221884450 is an frugal number, since it uses more digits than its factorization.

65221884450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050 (or 4023 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 65221884450 in words is "sixty-five billion, two hundred twenty-one million, eight hundred eighty-four thousand, four hundred fifty".