3722647007621 has 4 divisors (see below), whose sum is σ = 3723932011212. Its totient is φ = 3721362004032.

The previous prime is 3722647007581. The next prime is 3722647007687. The reversal of 3722647007621 is 1267007462273.

3722647007621 is digitally balanced in base 3, 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 2060904292225 + 1661742715396 = 1435585^2 + 1289086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3722647007621 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 (3722647004621) 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, 642497450 + ... + 642503243.

It is an arithmetic number, because the mean of its divisors is an integer number (930983002803).

Almost surely, 2^{3722647007621} is an apocalyptic number.

It is an amenable number.

3722647007621 is a deficient number, since it is larger than the sum of its proper divisors (1285003591).

3722647007621 is a wasteful number, since it uses less digits than its factorization.

3722647007621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285003590.

The product of its (nonzero) digits is 1185408, while the sum is 47.

The spelling of 3722647007621 in words is "three trillion, seven hundred twenty-two billion, six hundred forty-seven million, seven thousand, six hundred twenty-one".