81542862311 has 2 divisors, whose sum is σ = 81542862312. Its totient is φ = 81542862310.

The previous prime is 81542862287. The next prime is 81542862353. The reversal of 81542862311 is 11326824518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81542862311 - 2²² = 81538668007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81542862361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40771431155 + 40771431156.

It is an arithmetic number, because the mean of its divisors is an integer number (40771431156).

Almost surely, 2^81542862311 is an apocalyptic number.

81542862311 is a deficient number, since it is larger than the sum of its proper divisors (1).

81542862311 is an equidigital number, since it uses as much as digits as its factorization.

81542862311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 41.

The spelling of 81542862311 in words is "eighty-one billion, five hundred forty-two million, eight hundred sixty-two thousand, three hundred eleven".