81474747474 has 16 divisors (see below), whose sum is σ = 167353535808. Its totient is φ = 26424242352.

The previous prime is 81474747461. The next prime is 81474747481. The reversal of 81474747474 is 47474747418.

It is an alternating number because its digits alternate between even and odd.

81474747474 is a modest number, since divided by 747474 gives 81474 as remainder.

It is an unprimeable number.

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, 183501462 + ... + 183501905.

It is an arithmetic number, because the mean of its divisors is an integer number (10459595988).

Almost surely, 2^81474747474 is an apocalyptic number.

81474747474 is an abundant number, since it is smaller than the sum of its proper divisors (85878788334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81474747474 is a wasteful number, since it uses less digits than its factorization.

81474747474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367003409.

The product of its digits is 19668992, while the sum is 57.

The spelling of 81474747474 in words is "eighty-one billion, four hundred seventy-four million, seven hundred forty-seven thousand, four hundred seventy-four".