3661369638 has 48 divisors (see below), whose sum is σ = 7709985648. Its totient is φ = 1158705600.

The previous prime is 3661369603. The next prime is 3661369651. The reversal of 3661369638 is 8369631663.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299608 + ... + 311588.

It is an arithmetic number, because the mean of its divisors is an integer number (160624701).

Almost surely, 2^3661369638 is an apocalyptic number.

3661369638 is an abundant number, since it is smaller than the sum of its proper divisors (4048616010).

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

3661369638 is a wasteful number, since it uses less digits than its factorization.

3661369638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12101 (or 12070 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 51.

The square root of 3661369638 is about 60509.2524991013. The cubic root of 3661369638 is about 1541.2787543187.

The spelling of 3661369638 in words is "three billion, six hundred sixty-one million, three hundred sixty-nine thousand, six hundred thirty-eight".