81450662357 has 2 divisors, whose sum is σ = 81450662358. Its totient is φ = 81450662356.

The previous prime is 81450662353. The next prime is 81450662401. The reversal of 81450662357 is 75326605418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60355714276 + 21094948081 = 245674^2 + 145241^2 .

It is a cyclic number.

It is not a de Polignac number, because 81450662357 - 2² = 81450662353 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81450662353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40725331178 + 40725331179.

It is an arithmetic number, because the mean of its divisors is an integer number (40725331179).

Almost surely, 2^81450662357 is an apocalyptic number.

It is an amenable number.

81450662357 is a deficient number, since it is larger than the sum of its proper divisors (1).

81450662357 is an equidigital number, since it uses as much as digits as its factorization.

81450662357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 81450662357 in words is "eighty-one billion, four hundred fifty million, six hundred sixty-two thousand, three hundred fifty-seven".