3661220302525 has 6 divisors (see below), whose sum is σ = 4539913175162. Its totient is φ = 2928976242000.

The previous prime is 3661220302477. The next prime is 3661220302529. The reversal of 3661220302525 is 5252030221663.

It can be written as a sum of positive squares in 3 ways, for example, as 351480608164 + 3309739694361 = 592858^2 + 1819269^2 .

It is not a de Polignac number, because 3661220302525 - 2⁹ = 3661220302013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661220302529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73224406026 + ... + 73224406075.

Almost surely, 2^{3661220302525} is an apocalyptic number.

It is an amenable number.

3661220302525 is a deficient number, since it is larger than the sum of its proper divisors (878692872637).

3661220302525 is a wasteful number, since it uses less digits than its factorization.

3661220302525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146448812111 (or 146448812106 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 3661220302525 in words is "three trillion, six hundred sixty-one billion, two hundred twenty million, three hundred two thousand, five hundred twenty-five".