81989596306 has 16 divisors (see below), whose sum is σ = 124906184064. Its totient is φ = 40355046864.

The previous prime is 81989596301. The next prime is 81989596319. The reversal of 81989596306 is 60369598918.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81989596301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15850 + ... + 405253.

It is an arithmetic number, because the mean of its divisors is an integer number (7806636504).

Almost surely, 2^81989596306 is an apocalyptic number.

81989596306 is a deficient number, since it is larger than the sum of its proper divisors (42916587758).

81989596306 is a wasteful number, since it uses less digits than its factorization.

81989596306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422625.

The product of its (nonzero) digits is 25194240, while the sum is 64.

The spelling of 81989596306 in words is "eighty-one billion, nine hundred eighty-nine million, five hundred ninety-six thousand, three hundred six".