81294971510 has 32 divisors (see below), whose sum is σ = 147621450240. Its totient is φ = 32232441472.

The previous prime is 81294971489. The next prime is 81294971521. The reversal of 81294971510 is 1517949218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453227 + ... + 606633.

It is an arithmetic number, because the mean of its divisors is an integer number (4613170320).

Almost surely, 2^81294971510 is an apocalyptic number.

81294971510 is a deficient number, since it is larger than the sum of its proper divisors (66326478730).

81294971510 is a wasteful number, since it uses less digits than its factorization.

81294971510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153880.

The product of its (nonzero) digits is 181440, while the sum is 47.

The spelling of 81294971510 in words is "eighty-one billion, two hundred ninety-four million, nine hundred seventy-one thousand, five hundred ten".