81162293563 has 4 divisors (see below), whose sum is σ = 87405546928. Its totient is φ = 74919040200.

The previous prime is 81162293561. The next prime is 81162293573. The reversal of 81162293563 is 36539226118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81162293563 - 2¹ = 81162293561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81162293561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3121626663 + ... + 3121626688.

It is an arithmetic number, because the mean of its divisors is an integer number (21851386732).

Almost surely, 2^81162293563 is an apocalyptic number.

81162293563 is a deficient number, since it is larger than the sum of its proper divisors (6243253365).

81162293563 is a wasteful number, since it uses less digits than its factorization.

81162293563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6243253364.

The product of its digits is 466560, while the sum is 46.

It can be divided in two parts, 811622 and 93563, that added together give a triangular number (905185 = T₁₃₄₅).

The spelling of 81162293563 in words is "eighty-one billion, one hundred sixty-two million, two hundred ninety-three thousand, five hundred sixty-three".