81214662152020 has 24 divisors (see below), whose sum is σ = 171503588239200. Its totient is φ = 32304379580832.

The previous prime is 81214662152011. The next prime is 81214662152053. The reversal of 81214662152020 is 2025126641218.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11342826330 + ... + 11342833489.

It is an arithmetic number, because the mean of its divisors is an integer number (7145982843300).

Almost surely, 2^{81214662152020} is an apocalyptic number.

It is an amenable number.

81214662152020 is an abundant number, since it is smaller than the sum of its proper divisors (90288926087180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81214662152020 is a wasteful number, since it uses less digits than its factorization.

81214662152020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22685660007 (or 22685660005 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

Adding to 81214662152020 its reverse (2025126641218), we get a palindrome (83239788793238).

The spelling of 81214662152020 in words is "eighty-one trillion, two hundred fourteen billion, six hundred sixty-two million, one hundred fifty-two thousand, twenty".