81551256828314 has 64 divisors (see below), whose sum is σ = 151405006636800. Its totient is φ = 32080159807488.

The previous prime is 81551256828299. The next prime is 81551256828337. The reversal of 81551256828314 is 41382865215518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 784328522 + ... + 784432490.

It is an arithmetic number, because the mean of its divisors is an integer number (2365703228700).

Almost surely, 2^{81551256828314} is an apocalyptic number.

81551256828314 is a deficient number, since it is larger than the sum of its proper divisors (69853749808486).

81551256828314 is a wasteful number, since it uses less digits than its factorization.

81551256828314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128247.

The product of its digits is 18432000, while the sum is 59.

The spelling of 81551256828314 in words is "eighty-one trillion, five hundred fifty-one billion, two hundred fifty-six million, eight hundred twenty-eight thousand, three hundred fourteen".