81967377051 has 12 divisors (see below), whose sum is σ = 135311225712. Its totient is φ = 46838501136.

The previous prime is 81967377017. The next prime is 81967377067. The reversal of 81967377051 is 15077376918.

It is not a de Polignac number, because 81967377051 - 2¹⁰ = 81967376027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81967377251) 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 11 ways as a sum of consecutive naturals, for example, 650534676 + ... + 650534801.

It is an arithmetic number, because the mean of its divisors is an integer number (11275935476).

Almost surely, 2^81967377051 is an apocalyptic number.

81967377051 is a deficient number, since it is larger than the sum of its proper divisors (53343848661).

81967377051 is a wasteful number, since it uses less digits than its factorization.

81967377051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301069490 (or 1301069487 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 54.

The spelling of 81967377051 in words is "eighty-one billion, nine hundred sixty-seven million, three hundred seventy-seven thousand, fifty-one".