820374070991 has 2 divisors, whose sum is σ = 820374070992. Its totient is φ = 820374070990.

The previous prime is 820374070961. The next prime is 820374071009. The reversal of 820374070991 is 199070473028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820374070991 - 2²⁶ = 820306962127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820374070951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410187035495 + 410187035496.

It is an arithmetic number, because the mean of its divisors is an integer number (410187035496).

Almost surely, 2^820374070991 is an apocalyptic number.

820374070991 is a deficient number, since it is larger than the sum of its proper divisors (1).

820374070991 is an equidigital number, since it uses as much as digits as its factorization.

820374070991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 820374070991 in words is "eight hundred twenty billion, three hundred seventy-four million, seventy thousand, nine hundred ninety-one".