3687720566401 has 4 divisors (see below), whose sum is σ = 3688260582100. Its totient is φ = 3687180550704.

The previous prime is 3687720566363. The next prime is 3687720566443. The reversal of 3687720566401 is 1046650277863.

3687720566401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3194712965376 + 493007601025 = 1787376^2 + 702145^2 .

It is a cyclic number.

It is not a de Polignac number, because 3687720566401 - 2¹³ = 3687720558209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3687720566461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269997606 + ... + 270011263.

It is an arithmetic number, because the mean of its divisors is an integer number (922065145525).

Almost surely, 2^{3687720566401} is an apocalyptic number.

It is an amenable number.

3687720566401 is a deficient number, since it is larger than the sum of its proper divisors (540015699).

3687720566401 is an equidigital number, since it uses as much as digits as its factorization.

3687720566401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540015698.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 3687720566401 in words is "three trillion, six hundred eighty-seven billion, seven hundred twenty million, five hundred sixty-six thousand, four hundred one".