205149669142 has 16 divisors (see below), whose sum is σ = 335849472000. Its totient is φ = 93208179240.

The previous prime is 205149669107. The next prime is 205149669169. The reversal of 205149669142 is 241966941502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2033142 + ... + 2131657.

It is an arithmetic number, because the mean of its divisors is an integer number (20990592000).

Almost surely, 2^205149669142 is an apocalyptic number.

205149669142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

205149669142 is a deficient number, since it is larger than the sum of its proper divisors (130699802858).

205149669142 is a wasteful number, since it uses less digits than its factorization.

205149669142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167051.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 205149669142 in words is "two hundred five billion, one hundred forty-nine million, six hundred sixty-nine thousand, one hundred forty-two".