206156981495 has 4 divisors (see below), whose sum is σ = 247388377800. Its totient is φ = 164925585192.

The previous prime is 206156981489. The next prime is 206156981497. The reversal of 206156981495 is 594189651602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206156981495 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206156981495.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206156981497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20615698145 + ... + 20615698154.

It is an arithmetic number, because the mean of its divisors is an integer number (61847094450).

Almost surely, 2^206156981495 is an apocalyptic number.

206156981495 is a deficient number, since it is larger than the sum of its proper divisors (41231396305).

206156981495 is an equidigital number, since it uses as much as digits as its factorization.

206156981495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41231396304.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 206156981495 in words is "two hundred six billion, one hundred fifty-six million, nine hundred eighty-one thousand, four hundred ninety-five".