646301733081881 has 2 divisors, whose sum is σ = 646301733081882. Its totient is φ = 646301733081880.

The previous prime is 646301733081859. The next prime is 646301733082009. The reversal of 646301733081881 is 188180337103646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635585243385856 + 10716489696025 = 25210816^2 + 3273605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646301733081881 is a prime.

It is a super-2 number, since 2×646301733081881² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646301733081881.

It is not a weakly prime, because it can be changed into another prime (646301733081281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323150866540940 + 323150866540941.

It is an arithmetic number, because the mean of its divisors is an integer number (323150866540941).

Almost surely, 2^{646301733081881} is an apocalyptic number.

It is an amenable number.

646301733081881 is a deficient number, since it is larger than the sum of its proper divisors (1).

646301733081881 is an equidigital number, since it uses as much as digits as its factorization.

646301733081881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 646301733081881 in words is "six hundred forty-six trillion, three hundred one billion, seven hundred thirty-three million, eighty-one thousand, eight hundred eighty-one".