3643381266 has 16 divisors (see below), whose sum is σ = 8327728704. Its totient is φ = 1040966064.

The previous prime is 3643381249. The next prime is 3643381267. The reversal of 3643381266 is 6621833463.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 86747173 = 3643381266 / (3 + 6 + 4 + 3 + 3 + 8 + 1 + 2 + 6 + 6).

It is not an unprimeable number, because it can be changed into a prime (3643381267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43373545 + ... + 43373628.

It is an arithmetic number, because the mean of its divisors is an integer number (520483044).

Almost surely, 2^3643381266 is an apocalyptic number.

3643381266 is an abundant number, since it is smaller than the sum of its proper divisors (4684347438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3643381266 is a wasteful number, since it uses less digits than its factorization.

3643381266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86747185.

The product of its digits is 373248, while the sum is 42.

The square root of 3643381266 is about 60360.4279805901. The cubic root of 3643381266 is about 1538.7504996586.

The spelling of 3643381266 in words is "three billion, six hundred forty-three million, three hundred eighty-one thousand, two hundred sixty-six".