1268155653 has 8 divisors (see below), whose sum is σ = 1695585600. Its totient is φ = 843081408.

The previous prime is 1268155639. The next prime is 1268155661. The reversal of 1268155653 is 3565518621.

It is a happy number.

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

It is not a de Polignac number, because 1268155653 - 2²⁰ = 1267107077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268155153) 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 7 ways as a sum of consecutive naturals, for example, 587668 + ... + 589821.

It is an arithmetic number, because the mean of its divisors is an integer number (211948200).

Almost surely, 2^1268155653 is an apocalyptic number.

It is an amenable number.

1268155653 is a deficient number, since it is larger than the sum of its proper divisors (427429947).

1268155653 is a wasteful number, since it uses less digits than its factorization.

1268155653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177851.

The product of its digits is 216000, while the sum is 42.

The square root of 1268155653 is about 35611.1731483252. The cubic root of 1268155653 is about 1082.4076524471.

The spelling of 1268155653 in words is "one billion, two hundred sixty-eight million, one hundred fifty-five thousand, six hundred fifty-three".