29942915661 has 6 divisors (see below), whose sum is σ = 43250878190. Its totient is φ = 19961943768.

The previous prime is 29942915659. The next prime is 29942915699. The reversal of 29942915661 is 16651924992.

29942915661 is a `hidden beast` number, since 2 + 9 + 9 + 429 + 156 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26727345225 + 3215570436 = 163485^2 + 56706^2 .

It is not a de Polignac number, because 29942915661 - 2¹ = 29942915659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29942915598 and 29942915607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29942905661) 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 5 ways as a sum of consecutive naturals, for example, 1663495306 + ... + 1663495323.

Almost surely, 2^29942915661 is an apocalyptic number.

It is an amenable number.

29942915661 is a deficient number, since it is larger than the sum of its proper divisors (13307962529).

29942915661 is a wasteful number, since it uses less digits than its factorization.

29942915661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326990635 (or 3326990632 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The spelling of 29942915661 in words is "twenty-nine billion, nine hundred forty-two million, nine hundred fifteen thousand, six hundred sixty-one".