3647243663881 has 4 divisors (see below), whose sum is σ = 3648298698772. Its totient is φ = 3646188628992.

The previous prime is 3647243663867. The next prime is 3647243663891. The reversal of 3647243663881 is 1883663427463.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59662947600 + 3587580716281 = 244260^2 + 1894091^2 .

It is a cyclic number.

It is not a de Polignac number, because 3647243663881 - 2¹⁷ = 3647243532809 is a prime.

It is a super-2 number, since 2×3647243663881² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3647243663851) 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, 527512260 + ... + 527519173.

It is an arithmetic number, because the mean of its divisors is an integer number (912074674693).

Almost surely, 2^{3647243663881} is an apocalyptic number.

It is an amenable number.

3647243663881 is a deficient number, since it is larger than the sum of its proper divisors (1055034891).

3647243663881 is a wasteful number, since it uses less digits than its factorization.

3647243663881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055034890.

The product of its digits is 83607552, while the sum is 61.

The spelling of 3647243663881 in words is "three trillion, six hundred forty-seven billion, two hundred forty-three million, six hundred sixty-three thousand, eight hundred eighty-one".