205142147651 has 4 divisors (see below), whose sum is σ = 234448168752. Its totient is φ = 175836126552.

The previous prime is 205142147599. The next prime is 205142147663. The reversal of 205142147651 is 156741241502.

205142147651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-205142147651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205142167651) 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 3 ways as a sum of consecutive naturals, for example, 14653010540 + ... + 14653010553.

It is an arithmetic number, because the mean of its divisors is an integer number (58612042188).

Almost surely, 2^205142147651 is an apocalyptic number.

205142147651 is a deficient number, since it is larger than the sum of its proper divisors (29306021101).

205142147651 is an equidigital number, since it uses as much as digits as its factorization.

205142147651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29306021100.

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 205142147651 in words is "two hundred five billion, one hundred forty-two million, one hundred forty-seven thousand, six hundred fifty-one".