81218862151 has 24 divisors (see below), whose sum is σ = 97796719440. Its totient is φ = 67174531200.

The previous prime is 81218862149. The next prime is 81218862181. The reversal of 81218862151 is 15126881218.

It is not a de Polignac number, because 81218862151 - 2¹ = 81218862149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81218862098 and 81218862107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81218862181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2428936 + ... + 2462146.

It is an arithmetic number, because the mean of its divisors is an integer number (4074863310).

Almost surely, 2^81218862151 is an apocalyptic number.

81218862151 is a deficient number, since it is larger than the sum of its proper divisors (16577857289).

81218862151 is a wasteful number, since it uses less digits than its factorization.

81218862151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34975 (or 34968 counting only the distinct ones).

The product of its digits is 61440, while the sum is 43.

The spelling of 81218862151 in words is "eighty-one billion, two hundred eighteen million, eight hundred sixty-two thousand, one hundred fifty-one".