205151817332 has 48 divisors (see below), whose sum is σ = 450284341248. Its totient is φ = 79450641120.

The previous prime is 205151817331. The next prime is 205151817361. The reversal of 205151817332 is 233718151502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205151817331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1942808 + ... + 2045679.

It is an arithmetic number, because the mean of its divisors is an integer number (9380923776).

Almost surely, 2^205151817332 is an apocalyptic number.

205151817332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

205151817332 is an abundant number, since it is smaller than the sum of its proper divisors (245132523916).

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

205151817332 is a wasteful number, since it uses less digits than its factorization.

205151817332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988676 (or 3988674 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

Adding to 205151817332 its reverse (233718151502), we get a palindrome (438869968834).

The spelling of 205151817332 in words is "two hundred five billion, one hundred fifty-one million, eight hundred seventeen thousand, three hundred thirty-two".