201772021648 has 10 divisors (see below), whose sum is σ = 390933291974. Its totient is φ = 100886010816.

The previous prime is 201772021603. The next prime is 201772021673. The reversal of 201772021648 is 846120277102.

It can be written as a sum of positive squares in only one way, i.e., 198263591824 + 3508429824 = 445268^2 + 59232^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 201772021648.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6305375661 + ... + 6305375692.

Almost surely, 2^201772021648 is an apocalyptic number.

It is an amenable number.

201772021648 is a deficient number, since it is larger than the sum of its proper divisors (189161270326).

201772021648 is a wasteful number, since it uses less digits than its factorization.

201772021648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610751361 (or 12610751355 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The spelling of 201772021648 in words is "two hundred one billion, seven hundred seventy-two million, twenty-one thousand, six hundred forty-eight".