81377247674 has 16 divisors (see below), whose sum is σ = 129273408000. Its totient is φ = 38287118784.

The previous prime is 81377247673. The next prime is 81377247689. The reversal of 81377247674 is 47674277318.

It is not an unprimeable number, because it can be changed into a prime (81377247671) 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 7 ways as a sum of consecutive naturals, for example, 86204 + ... + 412535.

It is an arithmetic number, because the mean of its divisors is an integer number (8079588000).

Almost surely, 2^81377247674 is an apocalyptic number.

81377247674 is a deficient number, since it is larger than the sum of its proper divisors (47896160326).

81377247674 is a wasteful number, since it uses less digits than its factorization.

81377247674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503557.

The product of its digits is 11063808, while the sum is 56.

The spelling of 81377247674 in words is "eighty-one billion, three hundred seventy-seven million, two hundred forty-seven thousand, six hundred seventy-four".