29782975661 has 4 divisors (see below), whose sum is σ = 30344918652. Its totient is φ = 29221032672.

The previous prime is 29782975657. The next prime is 29782975667. The reversal of 29782975661 is 16657928792.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15786666025 + 13996309636 = 125645^2 + 118306^2 .

It is a cyclic number.

It is not a de Polignac number, because 29782975661 - 2² = 29782975657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29782975594 and 29782975603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29782975667) 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 3 ways as a sum of consecutive naturals, for example, 280971416 + ... + 280971521.

It is an arithmetic number, because the mean of its divisors is an integer number (7586229663).

Almost surely, 2^29782975661 is an apocalyptic number.

It is an amenable number.

29782975661 is a deficient number, since it is larger than the sum of its proper divisors (561942991).

29782975661 is an equidigital number, since it uses as much as digits as its factorization.

29782975661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561942990.

The product of its digits is 22861440, while the sum is 62.

The spelling of 29782975661 in words is "twenty-nine billion, seven hundred eighty-two million, nine hundred seventy-five thousand, six hundred sixty-one".