81629946130 has 16 divisors (see below), whose sum is σ = 147412520640. Its totient is φ = 32545618992.

The previous prime is 81629946113. The next prime is 81629946133. The reversal of 81629946130 is 3164992618.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81629946133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13291710 + ... + 13297849.

It is an arithmetic number, because the mean of its divisors is an integer number (9213282540).

Almost surely, 2^81629946130 is an apocalyptic number.

81629946130 is a deficient number, since it is larger than the sum of its proper divisors (65782574510).

81629946130 is a wasteful number, since it uses less digits than its factorization.

81629946130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26589873.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 81629946130 in words is "eighty-one billion, six hundred twenty-nine million, nine hundred forty-six thousand, one hundred thirty".