81689750374 has 16 divisors (see below), whose sum is σ = 129026721600. Its totient is φ = 38682273384.

The previous prime is 81689750339. The next prime is 81689750381. The reversal of 81689750374 is 47305798618.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241312 + ... + 470755.

It is an arithmetic number, because the mean of its divisors is an integer number (8064170100).

Almost surely, 2^81689750374 is an apocalyptic number.

81689750374 is a deficient number, since it is larger than the sum of its proper divisors (47336971226).

81689750374 is a wasteful number, since it uses less digits than its factorization.

81689750374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715107.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 81689750374 in words is "eighty-one billion, six hundred eighty-nine million, seven hundred fifty thousand, three hundred seventy-four".