205097152690 has 16 divisors (see below), whose sum is σ = 381905043480. Its totient is φ = 79209934720.

The previous prime is 205097152627. The next prime is 205097152691. The reversal of 205097152690 is 96251790502.

205097152690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 176637800089 + 28459352601 = 420283^2 + 168699^2 .

It is a super-2 number, since 2×205097152690² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205097152690.

It is not an unprimeable number, because it can be changed into a prime (205097152691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353615491 + ... + 353616070.

Almost surely, 2^205097152690 is an apocalyptic number.

205097152690 is a deficient number, since it is larger than the sum of its proper divisors (176807890790).

205097152690 is a wasteful number, since it uses less digits than its factorization.

205097152690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707231597.

The product of its (nonzero) digits is 340200, while the sum is 46.

The spelling of 205097152690 in words is "two hundred five billion, ninety-seven million, one hundred fifty-two thousand, six hundred ninety".