70819561849 has 2 divisors, whose sum is σ = 70819561850. Its totient is φ = 70819561848.

The previous prime is 70819561847. The next prime is 70819561873. The reversal of 70819561849 is 94816591807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70613495824 + 206066025 = 265732^2 + 14355^2 .

It is a cyclic number.

It is not a de Polignac number, because 70819561849 - 2¹ = 70819561847 is a prime.

Together with 70819561847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 70819561793 and 70819561802.

It is not a weakly prime, because it can be changed into another prime (70819561847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35409780924 + 35409780925.

It is an arithmetic number, because the mean of its divisors is an integer number (35409780925).

Almost surely, 2^70819561849 is an apocalyptic number.

It is an amenable number.

70819561849 is a deficient number, since it is larger than the sum of its proper divisors (1).

70819561849 is an equidigital number, since it uses as much as digits as its factorization.

70819561849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 58.

The spelling of 70819561849 in words is "seventy billion, eight hundred nineteen million, five hundred sixty-one thousand, eight hundred forty-nine".