81037703489 has 2 divisors, whose sum is σ = 81037703490. Its totient is φ = 81037703488.

The previous prime is 81037703347. The next prime is 81037703519. The reversal of 81037703489 is 98430773018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71940359089 + 9097344400 = 268217^2 + 95380^2 .

It is a cyclic number.

It is not a de Polignac number, because 81037703489 - 2⁸ = 81037703233 is a prime.

It is not a weakly prime, because it can be changed into another prime (81037793489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40518851744 + 40518851745.

It is an arithmetic number, because the mean of its divisors is an integer number (40518851745).

Almost surely, 2^81037703489 is an apocalyptic number.

It is an amenable number.

81037703489 is a deficient number, since it is larger than the sum of its proper divisors (1).

81037703489 is an equidigital number, since it uses as much as digits as its factorization.

81037703489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 81037703489 in words is "eighty-one billion, thirty-seven million, seven hundred three thousand, four hundred eighty-nine".