205215354520031 has 16 divisors (see below), whose sum is σ = 212245095744000. Its totient is φ = 198293428350528.

The previous prime is 205215354520009. The next prime is 205215354520063. The reversal of 205215354520031 is 130025453512502.

It is a cyclic number.

It is not a de Polignac number, because 205215354520031 - 2¹⁸ = 205215354257887 is a prime.

It is a super-2 number, since 2×205215354520031² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205215354520091) 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, 27708806 + ... + 34325043.

It is an arithmetic number, because the mean of its divisors is an integer number (13265318484000).

Almost surely, 2^{205215354520031} is an apocalyptic number.

205215354520031 is a deficient number, since it is larger than the sum of its proper divisors (7029741223969).

205215354520031 is a wasteful number, since it uses less digits than its factorization.

205215354520031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62034718.

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 205215354520031 in words is "two hundred five trillion, two hundred fifteen billion, three hundred fifty-four million, five hundred twenty thousand, thirty-one".