42990165679 has 2 divisors, whose sum is σ = 42990165680. Its totient is φ = 42990165678.

The previous prime is 42990165677. The next prime is 42990165721. The reversal of 42990165679 is 97656109924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42990165679 - 2¹ = 42990165677 is a prime.

Together with 42990165677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42990165677) 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, 21495082839 + 21495082840.

It is an arithmetic number, because the mean of its divisors is an integer number (21495082840).

Almost surely, 2^42990165679 is an apocalyptic number.

42990165679 is a deficient number, since it is larger than the sum of its proper divisors (1).

42990165679 is an equidigital number, since it uses as much as digits as its factorization.

42990165679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7348320, while the sum is 58.

The spelling of 42990165679 in words is "forty-two billion, nine hundred ninety million, one hundred sixty-five thousand, six hundred seventy-nine".