813645797122 has 8 divisors (see below), whose sum is σ = 1250236224972. Its totient is φ = 396900388800.

The previous prime is 813645797093. The next prime is 813645797123. The reversal of 813645797122 is 221797546318.

It can be written as a sum of positive squares in 2 ways, for example, as 769095674361 + 44550122761 = 876981^2 + 211069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (813645797123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4961254779 + ... + 4961254942.

Almost surely, 2^813645797122 is an apocalyptic number.

813645797122 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

813645797122 is a deficient number, since it is larger than the sum of its proper divisors (436590427850).

813645797122 is a wasteful number, since it uses less digits than its factorization.

813645797122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9922509764.

The product of its digits is 5080320, while the sum is 55.

The spelling of 813645797122 in words is "eight hundred thirteen billion, six hundred forty-five million, seven hundred ninety-seven thousand, one hundred twenty-two".