205151122666 has 64 divisors (see below), whose sum is σ = 381328819200. Its totient is φ = 80783898624.

The previous prime is 205151122661. The next prime is 205151122691. The reversal of 205151122666 is 666221151502.

It is a super-2 number, since 2×205151122666² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205151122661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1612080 + ... + 1734676.

It is an arithmetic number, because the mean of its divisors is an integer number (5958262800).

Almost surely, 2^205151122666 is an apocalyptic number.

205151122666 is a deficient number, since it is larger than the sum of its proper divisors (176177696534).

205151122666 is a wasteful number, since it uses less digits than its factorization.

205151122666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122791.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 205151122666 in words is "two hundred five billion, one hundred fifty-one million, one hundred twenty-two thousand, six hundred sixty-six".