1242165556 has 12 divisors (see below), whose sum is σ = 2174266080. Its totient is φ = 620946680.

The previous prime is 1242165541. The next prime is 1242165557. The reversal of 1242165556 is 6555612421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242165557) 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 in 3 ways as a sum of consecutive naturals, for example, 11890 + ... + 51241.

It is an arithmetic number, because the mean of its divisors is an integer number (181188840).

Almost surely, 2^1242165556 is an apocalyptic number.

It is an amenable number.

1242165556 is a deficient number, since it is larger than the sum of its proper divisors (932100524).

1242165556 is a wasteful number, since it uses less digits than its factorization.

1242165556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68054 (or 68052 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 1242165556 is about 35244.3691389135. The cubic root of 1242165556 is about 1074.9621204608.

Adding to 1242165556 its reverse (6555612421), we get a palindrome (7797777977).

It can be divided in two parts, 12421 and 65556, that added together give a palindrome (77977).

The spelling of 1242165556 in words is "one billion, two hundred forty-two million, one hundred sixty-five thousand, five hundred fifty-six".