81377650263 has 32 divisors (see below), whose sum is σ = 133638220800. Its totient is φ = 42893807616.

The previous prime is 81377650229. The next prime is 81377650271. The reversal of 81377650263 is 36205677318.

It is not a de Polignac number, because 81377650263 - 2¹⁰ = 81377649239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81377650363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278878 + ... + 490436.

It is an arithmetic number, because the mean of its divisors is an integer number (4176194400).

Almost surely, 2^81377650263 is an apocalyptic number.

81377650263 is a deficient number, since it is larger than the sum of its proper divisors (52260570537).

81377650263 is a wasteful number, since it uses less digits than its factorization.

81377650263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212991.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 81377650263 in words is "eighty-one billion, three hundred seventy-seven million, six hundred fifty thousand, two hundred sixty-three".