3687720566399 has 4 divisors (see below), whose sum is σ = 3687739648536. Its totient is φ = 3687701484264.

The previous prime is 3687720566363. The next prime is 3687720566443. The reversal of 3687720566399 is 9936650277863.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3687720566399 is a prime.

It is a super-2 number, since 2×3687720566399² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3687720566339) 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, 9248189 + ... + 9638694.

It is an arithmetic number, because the mean of its divisors is an integer number (921934912134).

Almost surely, 2^{3687720566399} is an apocalyptic number.

3687720566399 is a deficient number, since it is larger than the sum of its proper divisors (19082137).

3687720566399 is a wasteful number, since it uses less digits than its factorization.

3687720566399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19082136.

The product of its (nonzero) digits is 617258880, while the sum is 71.

The spelling of 3687720566399 in words is "three trillion, six hundred eighty-seven billion, seven hundred twenty million, five hundred sixty-six thousand, three hundred ninety-nine".