42029404661 has 2 divisors, whose sum is σ = 42029404662. Its totient is φ = 42029404660.

The previous prime is 42029404643. The next prime is 42029404723. The reversal of 42029404661 is 16640492024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40598220100 + 1431184561 = 201490^2 + 37831^2 .

It is a cyclic number.

It is not a de Polignac number, because 42029404661 - 2¹⁴ = 42029388277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42029404961) 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 as a sum of consecutive naturals, namely, 21014702330 + 21014702331.

It is an arithmetic number, because the mean of its divisors is an integer number (21014702331).

Almost surely, 2^42029404661 is an apocalyptic number.

It is an amenable number.

42029404661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42029404661 is an equidigital number, since it uses as much as digits as its factorization.

42029404661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 38.

Adding to 42029404661 its reverse (16640492024), we get a palindrome (58669896685).

The spelling of 42029404661 in words is "forty-two billion, twenty-nine million, four hundred four thousand, six hundred sixty-one".