851897491619 has 2 divisors, whose sum is σ = 851897491620. Its totient is φ = 851897491618.

The previous prime is 851897491609. The next prime is 851897491631. The reversal of 851897491619 is 916194798158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851897491619 - 2¹² = 851897487523 is a prime.

It is a super-3 number, since 3×851897491619³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (851897491609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425948745809 + 425948745810.

It is an arithmetic number, because the mean of its divisors is an integer number (425948745810).

Almost surely, 2^851897491619 is an apocalyptic number.

851897491619 is a deficient number, since it is larger than the sum of its proper divisors (1).

851897491619 is an equidigital number, since it uses as much as digits as its factorization.

851897491619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39191040, while the sum is 68.

The spelling of 851897491619 in words is "eight hundred fifty-one billion, eight hundred ninety-seven million, four hundred ninety-one thousand, six hundred nineteen".