81242217276 has 48 divisors (see below), whose sum is σ = 207656537088. Its totient is φ = 24516691200.

The previous prime is 81242217253. The next prime is 81242217299. The reversal of 81242217276 is 67271224218.

It is an interprime number because it is at equal distance from previous prime (81242217253) and next prime (81242217299).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1245100 + ... + 1308723.

It is an arithmetic number, because the mean of its divisors is an integer number (4326177856).

Almost surely, 2^81242217276 is an apocalyptic number.

It is an amenable number.

81242217276 is an abundant number, since it is smaller than the sum of its proper divisors (126414319812).

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

81242217276 is a wasteful number, since it uses less digits than its factorization.

81242217276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554082 (or 2554080 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The spelling of 81242217276 in words is "eighty-one billion, two hundred forty-two million, two hundred seventeen thousand, two hundred seventy-six".