205075900390 has 8 divisors (see below), whose sum is σ = 369136620720. Its totient is φ = 82030360152.

The previous prime is 205075900387. The next prime is 205075900391. The reversal of 205075900390 is 93009570502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×205075900390² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205075900391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10253795010 + ... + 10253795029.

It is an arithmetic number, because the mean of its divisors is an integer number (46142077590).

Almost surely, 2^205075900390 is an apocalyptic number.

205075900390 is a deficient number, since it is larger than the sum of its proper divisors (164060720330).

205075900390 is a wasteful number, since it uses less digits than its factorization.

205075900390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20507590046.

The product of its (nonzero) digits is 85050, while the sum is 40.

The spelling of 205075900390 in words is "two hundred five billion, seventy-five million, nine hundred thousand, three hundred ninety".