42942056509679 has 2 divisors, whose sum is σ = 42942056509680. Its totient is φ = 42942056509678.

The previous prime is 42942056509643. The next prime is 42942056509697. The reversal of 42942056509679 is 97690565024924.

Together with next prime (42942056509697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42942056509679 - 2¹² = 42942056505583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42942056509699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21471028254839 + 21471028254840.

It is an arithmetic number, because the mean of its divisors is an integer number (21471028254840).

Almost surely, 2^{42942056509679} is an apocalyptic number.

42942056509679 is a deficient number, since it is larger than the sum of its proper divisors (1).

42942056509679 is an equidigital number, since it uses as much as digits as its factorization.

42942056509679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 293932800, while the sum is 68.

The spelling of 42942056509679 in words is "forty-two trillion, nine hundred forty-two billion, fifty-six million, five hundred nine thousand, six hundred seventy-nine".