81351577511 has 2 divisors, whose sum is σ = 81351577512. Its totient is φ = 81351577510.

The previous prime is 81351577499. The next prime is 81351577537. The reversal of 81351577511 is 11577515318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81351577511 - 2¹⁴ = 81351561127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81351577591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40675788755 + 40675788756.

It is an arithmetic number, because the mean of its divisors is an integer number (40675788756).

Almost surely, 2^81351577511 is an apocalyptic number.

81351577511 is a deficient number, since it is larger than the sum of its proper divisors (1).

81351577511 is an equidigital number, since it uses as much as digits as its factorization.

81351577511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 44.

The spelling of 81351577511 in words is "eighty-one billion, three hundred fifty-one million, five hundred seventy-seven thousand, five hundred eleven".