2156635635243 has 8 divisors (see below), whose sum is σ = 3026857032000. Its totient is φ = 1362085664328.

The previous prime is 2156635635239. The next prime is 2156635635283. The reversal of 2156635635243 is 3425365366512.

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

It is not a de Polignac number, because 2156635635243 - 2² = 2156635635239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2156635635233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18917856393 + ... + 18917856506.

It is an arithmetic number, because the mean of its divisors is an integer number (378357129000).

Almost surely, 2^{2156635635243} is an apocalyptic number.

2156635635243 is a deficient number, since it is larger than the sum of its proper divisors (870221396757).

2156635635243 is a wasteful number, since it uses less digits than its factorization.

2156635635243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37835712921.

The product of its digits is 11664000, while the sum is 51.

The spelling of 2156635635243 in words is "two trillion, one hundred fifty-six billion, six hundred thirty-five million, six hundred thirty-five thousand, two hundred forty-three".