801642991577 has 2 divisors, whose sum is σ = 801642991578. Its totient is φ = 801642991576.

The previous prime is 801642991517. The next prime is 801642991609. The reversal of 801642991577 is 775199246108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648123213721 + 153519777856 = 805061^2 + 391816^2 .

It is a cyclic number.

It is not a de Polignac number, because 801642991577 - 2¹⁰ = 801642990553 is a prime.

It is not a weakly prime, because it can be changed into another prime (801642991517) 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, 400821495788 + 400821495789.

It is an arithmetic number, because the mean of its divisors is an integer number (400821495789).

Almost surely, 2^801642991577 is an apocalyptic number.

It is an amenable number.

801642991577 is a deficient number, since it is larger than the sum of its proper divisors (1).

801642991577 is an equidigital number, since it uses as much as digits as its factorization.

801642991577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 801642991577 in words is "eight hundred one billion, six hundred forty-two million, nine hundred ninety-one thousand, five hundred seventy-seven".