81037670041 has 2 divisors, whose sum is σ = 81037670042. Its totient is φ = 81037670040.

The previous prime is 81037670027. The next prime is 81037670081. The reversal of 81037670041 is 14007673018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76939109641 + 4098560400 = 277379^2 + 64020^2 .

It is a cyclic number.

It is not a de Polignac number, because 81037670041 - 2²¹ = 81035572889 is a prime.

It is not a weakly prime, because it can be changed into another prime (81037670081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40518835020 + 40518835021.

It is an arithmetic number, because the mean of its divisors is an integer number (40518835021).

Almost surely, 2^81037670041 is an apocalyptic number.

It is an amenable number.

81037670041 is a deficient number, since it is larger than the sum of its proper divisors (1).

81037670041 is an equidigital number, since it uses as much as digits as its factorization.

81037670041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 81037670041 in words is "eighty-one billion, thirty-seven million, six hundred seventy thousand, forty-one".