3722647007581 has 2 divisors, whose sum is σ = 3722647007582. Its totient is φ = 3722647007580.

The previous prime is 3722647007561. The next prime is 3722647007687. The reversal of 3722647007581 is 1857007462273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3629291704900 + 93355302681 = 1905070^2 + 305541^2 .

It is a cyclic number.

It is not a de Polignac number, because 3722647007581 - 2⁹ = 3722647007069 is a prime.

It is a super-2 number, since 2×3722647007581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3722647007531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1861323503790 + 1861323503791.

It is an arithmetic number, because the mean of its divisors is an integer number (1861323503791).

Almost surely, 2^{3722647007581} is an apocalyptic number.

It is an amenable number.

3722647007581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3722647007581 is an equidigital number, since it uses as much as digits as its factorization.

3722647007581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 3722647007581 in words is "three trillion, seven hundred twenty-two billion, six hundred forty-seven million, seven thousand, five hundred eighty-one".