1242555565 has 8 divisors (see below), whose sum is σ = 1555895808. Its totient is φ = 950825040.

The previous prime is 1242555541. The next prime is 1242555569. The reversal of 1242555565 is 5655552421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1242555565 - 2¹⁷ = 1242424493 is a prime.

It is a super-2 number, since 2×1242555565² = 3087888664224938450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242555569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5402301 + ... + 5402530.

It is an arithmetic number, because the mean of its divisors is an integer number (194486976).

Almost surely, 2^1242555565 is an apocalyptic number.

It is an amenable number.

1242555565 is a deficient number, since it is larger than the sum of its proper divisors (313340243).

1242555565 is a wasteful number, since it uses less digits than its factorization.

1242555565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10804859.

The product of its digits is 300000, while the sum is 40.

The square root of 1242555565 is about 35249.9016310684. The cubic root of 1242555565 is about 1075.0746124524.

The spelling of 1242555565 in words is "one billion, two hundred forty-two million, five hundred fifty-five thousand, five hundred sixty-five".