81502381007 has 2 divisors, whose sum is σ = 81502381008. Its totient is φ = 81502381006.

The previous prime is 81502381003. The next prime is 81502381031. The reversal of 81502381007 is 70018320518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81502381007 - 2² = 81502381003 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81502381003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40751190503 + 40751190504.

It is an arithmetic number, because the mean of its divisors is an integer number (40751190504).

Almost surely, 2^81502381007 is an apocalyptic number.

81502381007 is a deficient number, since it is larger than the sum of its proper divisors (1).

81502381007 is an equidigital number, since it uses as much as digits as its factorization.

81502381007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 81502381007 in words is "eighty-one billion, five hundred two million, three hundred eighty-one thousand, seven".