1648021556 has 6 divisors (see below), whose sum is σ = 2884037730. Its totient is φ = 824010776.

The previous prime is 1648021499. The next prime is 1648021559. The reversal of 1648021556 is 6551208461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1500787600 + 147233956 = 38740^2 + 12134^2 .

It is a super-2 number, since 2×1648021556² = 5431950098081322272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648021559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206002691 + ... + 206002698.

It is an arithmetic number, because the mean of its divisors is an integer number (480672955).

Almost surely, 2^1648021556 is an apocalyptic number.

It is an amenable number.

1648021556 is a deficient number, since it is larger than the sum of its proper divisors (1236016174).

1648021556 is a wasteful number, since it uses less digits than its factorization.

1648021556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412005393 (or 412005391 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1648021556 is about 40595.8317564747. The cubic root of 1648021556 is about 1181.1932667209.

The spelling of 1648021556 in words is "one billion, six hundred forty-eight million, twenty-one thousand, five hundred fifty-six".