3522620608721 has 4 divisors (see below), whose sum is σ = 3526591996992. Its totient is φ = 3518649220452.

The previous prime is 3522620608649. The next prime is 3522620608783. The reversal of 3522620608721 is 1278060262253.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3522620608721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3522620608121) 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, 1985692805 + ... + 1985694578.

It is an arithmetic number, because the mean of its divisors is an integer number (881647999248).

Almost surely, 2^{3522620608721} is an apocalyptic number.

It is an amenable number.

3522620608721 is a deficient number, since it is larger than the sum of its proper divisors (3971388271).

3522620608721 is an equidigital number, since it uses as much as digits as its factorization.

3522620608721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971388270.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 3522620608721 in words is "three trillion, five hundred twenty-two billion, six hundred twenty million, six hundred eight thousand, seven hundred twenty-one".