205606757642 has 48 divisors (see below), whose sum is σ = 365237794656. Its totient is φ = 86229607200.

The previous prime is 205606757627. The next prime is 205606757663. The reversal of 205606757642 is 246757606502.

It is a happy number.

It is a super-2 number, since 2×205606757642² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7571453 + ... + 7598559.

It is an arithmetic number, because the mean of its divisors is an integer number (7609120722).

Almost surely, 2^205606757642 is an apocalyptic number.

205606757642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

205606757642 is a deficient number, since it is larger than the sum of its proper divisors (159631037014).

205606757642 is a wasteful number, since it uses less digits than its factorization.

205606757642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29555 (or 29544 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 205606757642 in words is "two hundred five billion, six hundred six million, seven hundred fifty-seven thousand, six hundred forty-two".