3661007645 has 4 divisors (see below), whose sum is σ = 4393209180. Its totient is φ = 2928806112.

The previous prime is 3661007641. The next prime is 3661007663. The reversal of 3661007645 is 5467001663.

It is a happy number.

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 2290675321 + 1370332324 = 47861^2 + 37018^2 .

It is a cyclic number.

It is not a de Polignac number, because 3661007645 - 2² = 3661007641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3661007599 and 3661007608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661007641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366100760 + ... + 366100769.

It is an arithmetic number, because the mean of its divisors is an integer number (1098302295).

Almost surely, 2^3661007645 is an apocalyptic number.

It is an amenable number.

3661007645 is a deficient number, since it is larger than the sum of its proper divisors (732201535).

3661007645 is an equidigital number, since it uses as much as digits as its factorization.

3661007645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732201534.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 3661007645 is about 60506.2612049365. The cubic root of 3661007645 is about 1541.2279581628.

The spelling of 3661007645 in words is "three billion, six hundred sixty-one million, seven thousand, six hundred forty-five".