77142412891 has 2 divisors, whose sum is σ = 77142412892. Its totient is φ = 77142412890.

The previous prime is 77142412889. The next prime is 77142412903. The reversal of 77142412891 is 19821424177.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77142412891 - 2¹ = 77142412889 is a prime.

Together with 77142412889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77142412591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38571206445 + 38571206446.

It is an arithmetic number, because the mean of its divisors is an integer number (38571206446).

Almost surely, 2^77142412891 is an apocalyptic number.

77142412891 is a deficient number, since it is larger than the sum of its proper divisors (1).

77142412891 is an equidigital number, since it uses as much as digits as its factorization.

77142412891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The spelling of 77142412891 in words is "seventy-seven billion, one hundred forty-two million, four hundred twelve thousand, eight hundred ninety-one".