81149943410 has 64 divisors (see below), whose sum is σ = 151636091904. Its totient is φ = 31235500800.

The previous prime is 81149943397. The next prime is 81149943421. The reversal of 81149943410 is 1434994118.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48679397 + ... + 48681063.

It is an arithmetic number, because the mean of its divisors is an integer number (2369313936).

Almost surely, 2^81149943410 is an apocalyptic number.

81149943410 is a deficient number, since it is larger than the sum of its proper divisors (70486148494).

81149943410 is a wasteful number, since it uses less digits than its factorization.

81149943410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 81149943410 in words is "eighty-one billion, one hundred forty-nine million, nine hundred forty-three thousand, four hundred ten".