81542862353 has 2 divisors, whose sum is σ = 81542862354. Its totient is φ = 81542862352.

The previous prime is 81542862311. The next prime is 81542862361. The reversal of 81542862353 is 35326824518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80487392209 + 1055470144 = 283703^2 + 32488^2 .

It is a cyclic number.

It is not a de Polignac number, because 81542862353 - 2³² = 77247895057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81542862298 and 81542862307.

It is not a weakly prime, because it can be changed into another prime (81542862053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40771431176 + 40771431177.

It is an arithmetic number, because the mean of its divisors is an integer number (40771431177).

Almost surely, 2^81542862353 is an apocalyptic number.

It is an amenable number.

81542862353 is a deficient number, since it is larger than the sum of its proper divisors (1).

81542862353 is an equidigital number, since it uses as much as digits as its factorization.

81542862353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 47.

The spelling of 81542862353 in words is "eighty-one billion, five hundred forty-two million, eight hundred sixty-two thousand, three hundred fifty-three".