81377808410 has 16 divisors (see below), whose sum is σ = 146639462400. Its totient is φ = 32515699536.

The previous prime is 81377808403. The next prime is 81377808443. The reversal of 81377808410 is 1480877318.

It is a super-2 number, since 2×81377808410² (a number of 23 digits) contains 22 as substring.

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, 4418330 + ... + 4436709.

It is an arithmetic number, because the mean of its divisors is an integer number (9164966400).

Almost surely, 2^81377808410 is an apocalyptic number.

81377808410 is a deficient number, since it is larger than the sum of its proper divisors (65261653990).

81377808410 is a wasteful number, since it uses less digits than its factorization.

81377808410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8855965.

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 81377808410 in words is "eighty-one billion, three hundred seventy-seven million, eight hundred eight thousand, four hundred ten".