1242153665 has 16 divisors (see below), whose sum is σ = 1544147280. Its totient is φ = 958110720.

The previous prime is 1242153641. The next prime is 1242153719. The reversal of 1242153665 is 5663512421.

It can be written as a sum of positive squares in 8 ways, for example, as 65869456 + 1176284209 = 8116^2 + 34297^2 .

It is not a de Polignac number, because 1242153665 - 2²² = 1237959361 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104717 + ... + 115973.

It is an arithmetic number, because the mean of its divisors is an integer number (96509205).

Almost surely, 2^1242153665 is an apocalyptic number.

It is an amenable number.

1242153665 is a deficient number, since it is larger than the sum of its proper divisors (301993615).

1242153665 is a wasteful number, since it uses less digits than its factorization.

1242153665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12052.

The product of its digits is 43200, while the sum is 35.

The square root of 1242153665 is about 35244.2004448959. The cubic root of 1242153665 is about 1074.9586903181.

The spelling of 1242153665 in words is "one billion, two hundred forty-two million, one hundred fifty-three thousand, six hundred sixty-five".