42003215632661 has 2 divisors, whose sum is σ = 42003215632662. Its totient is φ = 42003215632660.

The previous prime is 42003215632541. The next prime is 42003215632691. The reversal of 42003215632661 is 16623651230024.

42003215632661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36764637658225 + 5238577974436 = 6063385^2 + 2288794^2 .

It is a cyclic number.

It is not a de Polignac number, because 42003215632661 - 2³⁰ = 42002141890837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42003215632691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21001607816330 + 21001607816331.

It is an arithmetic number, because the mean of its divisors is an integer number (21001607816331).

Almost surely, 2^{42003215632661} is an apocalyptic number.

It is an amenable number.

42003215632661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42003215632661 is an equidigital number, since it uses as much as digits as its factorization.

42003215632661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 42003215632661 its reverse (16623651230024), we get a palindrome (58626866862685).

The spelling of 42003215632661 in words is "forty-two trillion, three billion, two hundred fifteen million, six hundred thirty-two thousand, six hundred sixty-one".