81002722506 has 8 divisors (see below), whose sum is σ = 162005445024. Its totient is φ = 27000907500.

The previous prime is 81002722447. The next prime is 81002722511. The reversal of 81002722506 is 60522720018.

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

81002722506 is an admirable number.

It is a super-2 number, since 2×81002722506² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6750226870 + ... + 6750226881.

It is an arithmetic number, because the mean of its divisors is an integer number (20250680628).

Almost surely, 2^81002722506 is an apocalyptic number.

81002722506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81002722506 is a wasteful number, since it uses less digits than its factorization.

81002722506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13500453756.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 81002722506 in words is "eighty-one billion, two million, seven hundred twenty-two thousand, five hundred six".