205169137936 has 75 divisors (see below), whose sum is σ = 463940898423. Its totient is φ = 87891582240.

The previous prime is 205169137931. The next prime is 205169137949. The reversal of 205169137936 is 639731961502.

The square root of 205169137936 is 452956.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×205169137936² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205169137931) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 88778221 + ... + 88780531.

Almost surely, 2^205169137936 is an apocalyptic number.

205169137936 is the 452956-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205169137936

205169137936 is an abundant number, since it is smaller than the sum of its proper divisors (258771760487).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205169137936 is an frugal number, since it uses more digits than its factorization.

205169137936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 52.

The spelling of 205169137936 in words is "two hundred five billion, one hundred sixty-nine million, one hundred thirty-seven thousand, nine hundred thirty-six".