3661320356613 has 6 divisors (see below), whose sum is σ = 5288573848454. Its totient is φ = 2440880237736.

The previous prime is 3661320356567. The next prime is 3661320356647. The reversal of 3661320356613 is 3166530231663.

3661320356613 is a `hidden beast` number, since 3 + 6 + 6 + 1 + 3 + 20 + 3 + 5 + 6 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2098375324929 + 1562945031684 = 1448577^2 + 1250178^2 .

It is not a de Polignac number, because 3661320356613 - 2²⁸ = 3661051921157 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 (3661320356663) 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, 203406686470 + ... + 203406686487.

Almost surely, 2^{3661320356613} is an apocalyptic number.

It is an amenable number.

3661320356613 is a deficient number, since it is larger than the sum of its proper divisors (1627253491841).

3661320356613 is a wasteful number, since it uses less digits than its factorization.

3661320356613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406813372963 (or 406813372960 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 45.

The spelling of 3661320356613 in words is "three trillion, six hundred sixty-one billion, three hundred twenty million, three hundred fifty-six thousand, six hundred thirteen".