81850699379 has 2 divisors, whose sum is σ = 81850699380. Its totient is φ = 81850699378.

The previous prime is 81850699367. The next prime is 81850699423. The reversal of 81850699379 is 97399605818.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81850699379 is a prime.

It is not a weakly prime, because it can be changed into another prime (81850699319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40925349689 + 40925349690.

It is an arithmetic number, because the mean of its divisors is an integer number (40925349690).

Almost surely, 2^81850699379 is an apocalyptic number.

81850699379 is a deficient number, since it is larger than the sum of its proper divisors (1).

81850699379 is an equidigital number, since it uses as much as digits as its factorization.

81850699379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 65.

The spelling of 81850699379 in words is "eighty-one billion, eight hundred fifty million, six hundred ninety-nine thousand, three hundred seventy-nine".