361806664826881 has 16 divisors (see below), whose sum is σ = 374801250807808. Its totient is φ = 348894815950800.

The previous prime is 361806664826857. The next prime is 361806664826897. The reversal of 361806664826881 is 188628466608163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-361806664826881 is a prime.

It is a super-2 number, since 2×361806664826881² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (361806664821881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1718797420 + ... + 1719007906.

It is an arithmetic number, because the mean of its divisors is an integer number (23425078175488).

Almost surely, 2^{361806664826881} is an apocalyptic number.

361806664826881 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

361806664826881 is a deficient number, since it is larger than the sum of its proper divisors (12994585980927).

361806664826881 is a wasteful number, since it uses less digits than its factorization.

361806664826881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406732.

The product of its (nonzero) digits is 764411904, while the sum is 73.

The spelling of 361806664826881 in words is "three hundred sixty-one trillion, eight hundred six billion, six hundred sixty-four million, eight hundred twenty-six thousand, eight hundred eighty-one".