81071426288 has 20 divisors (see below), whose sum is σ = 157083585888. Its totient is φ = 40533726720.

The previous prime is 81071426279. The next prime is 81071426297. The reversal of 81071426288 is 88262417018.

It is an interprime number because it is at equal distance from previous prime (81071426279) and next prime (81071426297).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 245993 + ... + 471863.

Almost surely, 2^81071426288 is an apocalyptic number.

It is an amenable number.

81071426288 is a deficient number, since it is larger than the sum of its proper divisors (76012159600).

81071426288 is a wasteful number, since it uses less digits than its factorization.

81071426288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248312 (or 248306 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 47.

The spelling of 81071426288 in words is "eighty-one billion, seventy-one million, four hundred twenty-six thousand, two hundred eighty-eight".