42130435661 has 4 divisors (see below), whose sum is σ = 42131465532. Its totient is φ = 42129405792.

The previous prime is 42130435643. The next prime is 42130435663. The reversal of 42130435661 is 16653403124.

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 7907655625 + 34222780036 = 88925^2 + 184994^2 .

It is a cyclic number.

It is not a de Polignac number, because 42130435661 - 2⁶ = 42130435597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42130435663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450920 + ... + 536273.

It is an arithmetic number, because the mean of its divisors is an integer number (10532866383).

Almost surely, 2^42130435661 is an apocalyptic number.

It is an amenable number.

42130435661 is a deficient number, since it is larger than the sum of its proper divisors (1029871).

42130435661 is an equidigital number, since it uses as much as digits as its factorization.

42130435661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029870.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 42130435661 its reverse (16653403124), we get a palindrome (58783838785).

The spelling of 42130435661 in words is "forty-two billion, one hundred thirty million, four hundred thirty-five thousand, six hundred sixty-one".