205991238992 has 40 divisors (see below), whose sum is σ = 497589229632. Its totient is φ = 80256326400.

The previous prime is 205991238961. The next prime is 205991239007. The reversal of 205991238992 is 299832199502.

It is a super-2 number, since 2×205991238992² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83599109 + ... + 83601572.

Almost surely, 2^205991238992 is an apocalyptic number.

205991238992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

205991238992 is an abundant number, since it is smaller than the sum of its proper divisors (291597990640).

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

205991238992 is a wasteful number, since it uses less digits than its factorization.

205991238992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167200707 (or 167200701 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 59.

The spelling of 205991238992 in words is "two hundred five billion, nine hundred ninety-one million, two hundred thirty-eight thousand, nine hundred ninety-two".