81357228262 has 16 divisors (see below), whose sum is σ = 127662537312. Its totient is φ = 38811960000.

The previous prime is 81357228221. The next prime is 81357228313. The reversal of 81357228262 is 26282275318.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2209239 + ... + 2245762.

It is an arithmetic number, because the mean of its divisors is an integer number (7978908582).

Almost surely, 2^81357228262 is an apocalyptic number.

81357228262 is a deficient number, since it is larger than the sum of its proper divisors (46305309050).

81357228262 is a wasteful number, since it uses less digits than its factorization.

81357228262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4455423.

The product of its digits is 645120, while the sum is 46.

The spelling of 81357228262 in words is "eighty-one billion, three hundred fifty-seven million, two hundred twenty-eight thousand, two hundred sixty-two".