81964623914 has 8 divisors (see below), whose sum is σ = 125266689540. Its totient is φ = 40209060736.

The previous prime is 81964623907. The next prime is 81964623997. The reversal of 81964623914 is 41932646918.

It can be written as a sum of positive squares in 2 ways, for example, as 79814725225 + 2149898689 = 282515^2 + 46367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386625479 + ... + 386625690.

Almost surely, 2^81964623914 is an apocalyptic number.

81964623914 is a deficient number, since it is larger than the sum of its proper divisors (43302065626).

81964623914 is a wasteful number, since it uses less digits than its factorization.

81964623914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773251224.

The product of its digits is 2239488, while the sum is 53.

The spelling of 81964623914 in words is "eighty-one billion, nine hundred sixty-four million, six hundred twenty-three thousand, nine hundred fourteen".